Lenovo Erazer X700 Desktop Hardware Maintenance Manual English

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Machine Types: 10122/90A2 - Page 1

Lenovo Erazer X700 Hardware Maintenance Manual Machine Types: 10122/90A2

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Machine Types: 10122/90A2 - Page 3

Lenovo Erazer X700 Hardware Maintenance Manual Machine Types: 10122/90A2

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First Edition (January 2013) - Page 4

First Edition (January 2013) 31st © Copyright Lenovo 2013. LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software are delivered pursuant a General Services Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-35F-05925

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Contents - Page 5

Contents Chapter 1. About this manual . . . . . . 1 Important Safety Information . . . . . . . . . . 1 Chapter 2. Safety information . . . . . . 3 General safety . . . . . . . . . . . . . . . . 3 Electrical safety . . . . . . . . . . . . . . . 3 Safety inspection guide . . . . . . . . . . . . 5 Handling electrostatic discharge-sensitive devices . . . . . . . . . . . . . . . . . . 5 Grounding requirements . . . . . . . . . . . . 6 Safety notices . . . . . . . . . . . . . . . . 6 Chapter 3. General information . . . . . 9 Specifications . . . . . . . . . . . . . . . . 9 Chapter 4. General Che..

Lenovo Erazer X700Hardware Maintenance Manual - Page 6

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Important Safety Information - Page 7

Chapter 1. About this manual This manual contains service and reference information for Lenovo Erazer X700 desktop computers listed on the cover. It is intended only for trained servicers who are familiar with Lenovo computer products. Before servicing a Lenovo product, be sure to read the Safety Information. The description of the TV card in this manual is only used for the machines which have the TV card. It is invalid for those machines which do not have TV card. Important Safety Information Be sure to read all caution and danger statements in this book before performing any of the instr..

Lenovo Erazer X700Hardware Maintenance Manual - Page 8

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General safety - Page 9

Chapter 2. Safety information This chapter contains the safety information that you need to be familiar with before servicing a computer. General safety Follow these rules to ensure general safety: • Observe good housekeeping in the area of the machines during and after maintenance. • When lifting any heavy object: 1. Ensure you can stand safely without slipping. 2. Distribute the weight of the object equally between your feet. 3. Use a slow lifting force. Never move suddenly or twist when you attempt to lift. 4. Lift by standing or by pushing up with your leg muscles; this action remov..

Lenovo Erazer X700Hardware Maintenance Manual - Page 10

Observe the following rules when working on electrical equipment. Important: Use only approved tools and test equipment. Some hand tools have handles covered with a soft material that does not insulate you when working with live electrical currents. Many customers have, near their equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges. Do not use this type of mat to protect yourself from electrical shock. • Find the room emergency power-off (EPO) switch, disconnecting switch, or electrical outlet. If an electrical accident occurs, you can th..

Safety inspection guide - Page 11

– Send another person to get medical aid. Safety inspection guide The intent of this inspection guide is to assist you in identifying potentially unsafe conditions on these products. Each machine, as it was designed and built, had required safety items installed to protect users and service personnel from injury. This guide addresses only those items. However, good judgment should be used to identify potential safety hazards due to attachment of features or options not covered by this inspection guide. If any unsafe conditions are present, you must determine how serious the apparent hazar..

Lenovo Erazer X700Hardware Maintenance Manual - Page 12

• Avoid contact with other people while handling the part. • Wear a grounded wrist strap against your skin to eliminate static on your body. • Prevent the part from touching your clothing. Most clothing is insulative and retains a charge even when you are wearing a wrist strap. • Use the black side of a grounded work mat to provide a static-free work surface. The mat is especially useful when handling ESD-sensitive devices. • Select a grounding system, such as those listed below, to provide protection that meets the specific service requirement. Note: The use of a grounding system..

To Connect - Page 13

To Connect To Disconnect 1. Turn everything OFF. 2. First, attach all cables to devices. 3. Attach signal cables to connectors. 4. Attach power cords to outlet. 5. Turn device ON. 1. Turn everything OFF. 2. First, remove power cords from outlet. 3. Remove signal cables from connectors. 4. Remove all cables from devices. CAUTION: When replacing the lithium battery, use only Part Number 45C1566 or an equivalent type battery recommended by the manufacturer. If your system has a module containing a lithium battery, replace it only with the same module type made by the same manufacturer. The bat..

Lenovo Erazer X700Hardware Maintenance Manual - Page 14

≥18 kg(37 lbs) ≥32 kg(70.5 lbs) ≥55 kg(121.2 lbs) CAUTION: Use safe practices when lifting. CAUTION: The power control button on the device and the power switch on the power supply do not turn off the electrical current supplied to the device. The device also might have more than one power cord. To remove all electrical current from the device, ensure that all power cords are disconnected from the power source. 1 2 CAUTION: Do not place any object weighing more than 82 kg (180 lbs.) on top of rack-mounted devices. 8 Lenovo Erazer X700Hardware Maintenance Manual

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Type Lenovo Erazer X700 - Page 15

Chapter 3. General information This chapter provides general information that applies to all machine types supported by this publication. Specifications This section lists the physical specifications for your computer. This section lists the physical specifications for your computer. Type Lenovo Erazer X700 This section lists the physical specifications. Environment Air temperature: Operating: 10° to 35°C Transit: -20° to 55°C Humidity: Operating: 35% to 80% Transit: 20% to 90% (40°C) Altitude: 86KPa to 106KPa Electrical input: Input voltage: 90V-264V(AC) Input frequency: 47Hz-63Hz © ..

Lenovo Erazer X700Hardware Maintenance Manual - Page 16

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Chapter 4. - Page 17

Chapter 4. General Checkout Attention: The drives in the computer you are servicing might have been rearranged or the drive startup sequence changed. Be extremely careful during write operations such as copying, saving, or formatting. Data or programs can be overwritten if you select an incorrect drive. General error messages appear if a problem or conflict is found by an application program, the operating system, or both. For an explanation of these messages, refer to the information supplied with that software package. Use the following procedure to help determine the cause of the problem..

Lenovo Erazer X700Hardware Maintenance Manual - Page 18

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Starting the Lenovo BIOS Setup Utility program - Page 19

Chapter 5. Using the Setup Utility The Setup Utility program is used to view and change the configuration settings of your computer, regardless of which operating system you are using. However, the operating-system settings might override any similar settings in the Setup Utility program. Starting the Lenovo BIOS Setup Utility program To start the Lenovo BIOS Setup Utility program, do the following: 1. If your computer is already on when you start this procedure, shut down the operating system and turn off the computer. 2. Press and hold the F1 key then turn on the computer. When the Lenovo..

Lenovo Erazer X700Hardware Maintenance Manual - Page 20

Administrator Password Setting an Administrator Password deters unauthorized persons from changing configuration settings. You might want to set an Administrator Password if you are responsible for maintaining the settings of several computers. After you set an Administrator Password, a password prompt is displayed every time you access the Lenovo BIOS Setup Utility program. If both the Administrator and Power-On Password are set, you can type either password. However, you must use your Administrator Password to change any configuration settings. Setting, changing, or deleting an Administra..

Enabling or disabling a device - Page 21

To set a Power-On Password, do the following: 1. Start the Lenovo BIOS Setup Utility program (See ”Starting the Lenovo BIOS Setup Utility program” on page 13.) 2. From the Security menu, select Set Power-On Password and press the Enter key. 3. The password dialog box will be displayed. Type the password, and press the Enter key. 4. Re-type the password to confirm, if you type the password correctly, the password will be installed. To change a Power-On Password, do the following: 1. Start the Lenovo BIOS Setup Utility program (See ”Starting the Lenovo BIOS Setup Utility program” on p..

Lenovo Erazer X700Hardware Maintenance Manual - Page 22

Onboard Audio Controller Select whether to enable or disable the Onboard Audio Controller , when feature is set to Disabled all devices connected to the audio connectors (e.g. a headphone or a microphone) are disabled and can’t be used. Onboard Ethernet Controller or LAN Boot Agent Select whether to enable or disable Onboard Ethernet Controller , or select whether to enable or disable load onboard PXE ( Preboot Execution Environment ), or SMC ( Secure Managed Client ). This feature will allow the computer to boot from a server image. To enable or disable a device, do the following: 1. Sta..

Exiting the Lenovo BIOS Setup Utility program - Page 23

To view or permanently change the configured startup device sequence, do the following: 1. Start the Lenovo BIOS Setup Utility program (see “Starting the Lenovo BIOS Setup Utility program” on page 13). 2. From the Lenovo BIOS Setup Utility program main menu, select the Startup option. 3. Press the Enter key, and select the devices for the Primary Boot Sequence . Read the information displayed on the right side of the screen. 4. Use › and fl arrows to select a device. Use the <+> or <-> keys to move a device up or down. Use the <×> key to exclude the device from or i..

Lenovo Erazer X700Hardware Maintenance Manual - Page 24

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Hard disk drive boot error - Page 25

Chapter 6. Symptom-to-FRU Index The Symptom-to-FRU index lists error symptoms and possible causes. The most likely cause is listed first. Always begin with Chapter 4, “General Checkout,” on page 11. This index can also be used to help you decide which FRUs to have available when servicing a computer. If you are unable to correct the problem using this index, go to “Undetermined problems” on page 20. Notes: • If you have both an error message and an incorrect audio response, diagnose the error message first. • If you cannot run the diagnostic tests or you get a diagnostic error c..

Lenovo Erazer X700Hardware Maintenance Manual - Page 26

POST error codes Each time you turn the computer on, it performs a series of tests to check that the system is operating correctly and that certain options are set. This series of tests is called the Power-On Self-Test , or POST . POST does the following: • Checks some basic system-board operations • Checks that the memory is working correctly • Starts video operations • Verifies that the boot drive is working POST Error Message Description/Action Keyboard error Cannot initialize the keyboard. Make sure the keyboard is properly connected to the computer and that no keys are held pre..

Hardware components - Page 27

Chapter 7. Locating connectors, controls and components This section provides illustrations to help locate the various connectors, controls and components of the computer. Hardware components The following illustration shows the components that make up your computer. 1. Power supply 5. Graphics card 2. Heat sink 6. Solid state drive 3. Memory modules 7. Hard disk drive 4. Motherboard 8. System fan © Copyright Lenovo 2013 21

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Lenovo Erazer X700Hardware Maintenance Manual - Page 28

Identifying parts on the motherboard The motherboard (sometimes called the planar or system board) is the main circuit board in your computer. It provides basic computing functions and supports a variety of devices that are factory-installed or that you can install later. The following illustration shows the location of connectors and components on the front of the motherboard. 1. System fan connectors 9. SATA connectors (2) 2. 8-pins power connector 10. Front panel connectors 3. Memory slots (4) 11. USB 2.0 connectors (3) 4. Microprocessor and socket 12. LPC debug connector 5. Microprocess..

Pre-disassembly instructions - Page 29

Chapter 8. Replacing hardware Attention: Do not remove the computer cover or attempt any repair before reading the “Important safety information” in the Safety and Warranty Guide that was included with your computer. To obtain copies of the Safety and Warranty Guide, go to the Support Web site at: http://consumersupport.lenovo.com. Note: Use only parts provided by Lenovo. General information Pre-disassembly instructions Before proceeding with the disassembly procedure, make sure that you do the following: 1. Turn off the power to the system and all peripherals. 2. Unplug all power and s..

Lenovo Erazer X700Hardware Maintenance Manual - Page 30

Replacing the keyboard and mouse To replace the keyboard and mouse Step 1. Remove any media (disks, CDs, DVDs or memory cards) from the drives, shut down the operating system, and turn off the computer and all attached devices. Step 2. Unplug all power cords from electrical outlets. Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer. Refer to “Left and right view” and “Rear view” for help with locating the various connectors. Note: Your keyboard will be connected to a U..

Replacing a memory module - Page 31

Step 4. Remove the two screws that secure the computer cover at the rear of the chassis. 1 Step 5. Lift up the computer cover, then slide it out to remove it. 2 Step 6. To reattach the computer cover: a. Line up the computer cover with the chassis and place it into position. b. Secure the computer cover to the chassis with the two screws. Note: Both covers can be removed using the same method. Replacing a memory module Note: For this procedure, it helps to lay the computer flat. To replace an optical drive: Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut d..

Lenovo Erazer X700Hardware Maintenance Manual - Page 32

Step 6. Remove the memory module being replaced by opening the retaining clips as shown. Step 7. Position the new memory module over the memory connector. Make sure the notch 1 on the memory module is correctly aligned with the connector key 2 on the system board. Push the memory module straight down into the connector until the retaining clips close. Step 8. Reattach the computer cover. Replacing the hard disk drive Note: For this procedure, it helps to lay the computer flat. To replace the hard disk drive: Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut ..

Replacing a solid state drive - Page 33

Step 5. Disconnect the data and power cables from the hard disk drive. 1 Step 6. Lift the hard disk drive up and out of the drive bay. 2 Step 7. Remove the two pins to release the hard disk drive from the bracket. 3 4 Step 8. To install the new hard disk drive : a. Line up the new hard disk drive with the bracket and place it into position. b. Secure the new hard disk drive to the bracket with the two pins. c. Slide the new hard disk drive into the drive bay and snap it into place. d. Connect the data and power cables to the new hard disk drive. Step 9. Reattach the computer cover. Replac..

Lenovo Erazer X700Hardware Maintenance Manual - Page 34

Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer. Refer to “Left and right view” and “Rear view” for help with locating the various connectors. Step 4. Remove the computer cover. Refer to “Removing the computer cover”. Step 5. Disconnect the data and power cables from the solid state drive. 1 Step 6. Lift the solid state drive up and out of the drive bay. 2 Step 7. Remove the four screws that secure the solid state drive to the bracket. Step 8. To install the new ..

Chapter 8 - Page 35

Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating system, and turn off the computer and all attached devices. Step 2. Unplug all power cords from electrical outlets. Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer. Refer to “Left and right view” and “Rear view” for help with locating the various connectors. Step 4. Remove the computer cover. Refer to “Removing the computer cover”. Step 5. Disconnect the data and..

Lenovo Erazer X700Hardware Maintenance Manual - Page 36

Step 8. Open the front door, then slide out the optical drive as shown. 5 6 Step 9. To install the new optical drive: a. Slide the new optical drive into the bay from the front until it snaps into position. b. Connect the data and power cables to the new disk drive. Step 10. Reattach the computer cover. Replacing the graphic card To replace the graphic card: Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating system, and turn off the computer and all attached devices. Step 2. Unplug all power cords from electrical outlets. Step 3. Disconnect..

Replacing the heat-sink assembly - Page 37

Step 5. Remove the two screws that secure the graphics card to the chassis. 1 Step 6. Disconnect the power cables from the graphics card. 2 Step 7. Push the pin to unlock the graphics card 3 , and then lift up the graphics card to remove it. 4 Step 8. To install the new graphic card: a. Attach the new graphics card to the same adapter connector. b. Connect the power cables to the new graphics card. c. Secure the new graphics card to the chassis with the two screws. Step 9. Reattach the computer cover. Replacing the heat-sink assembly Note: For this procedure, it helps to lay the computer fl..

Lenovo Erazer X700Hardware Maintenance Manual - Page 38

Step 6. Remove the 8 screws that secure the heat-sink assembly to the motherboard and chassis. 1 Step 7. Remove the heat-sink assembly as shown. 2 Step 8. To install the new heat-sink assembly: a. Use a thermal grease syringe to place five drops of grease on the top of the microprocessor. Each drop of grease should be 0.03ml (3 tick marks on the grease syringe). b. Line up the screws on the new heat-sink with mounting holes on the motherboard and chassis, then secure it with the 8 screws. c. Reconnect the microprocessor fan power cable to the connector on the motherboard. Step 9. Reattach t..

Attention: - Page 39

Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating system, and turn off the computer and all attached devices. Step 2. Unplug all power cords from electrical outlets. Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer. Refer to “Left and right view” and “Rear view” for help with locating the various connectors. Step 4. Remove the computer cover. Refer to “Removing the computer cover”. Step 5. Replacing the heat-sink..

Lenovo Erazer X700Hardware Maintenance Manual - Page 40

Step 7. Holding the sides of the microprocessor with your fingers, remove the protective cover 1 that protects the gold contacts on the new microprocessor. 2 Step 8. Holding the sides of the microprocessor with your fingers, position the microprocessor so that the notches on the microprocessor are aligned with the tabs in the microprocessor socket. Important: To avoid damaging the microprocessor contacts, keep the microprocessor completely level while installing it into the socket. Step 9. Lower the microprocessor straight down into its socket on the motherboard. Step 10. To secure the micr..

Chapter 8 - Page 41

Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer. Refer to “Left and right view” and “Rear view” for help with locating the various connectors. Step 4. Remove the computer cover. Refer to “Removing the computer cover”. Step 5. Remove the heat-sink assembly. Refer to “Replacing the heat-sink assembly ”. Step 6. Disconnect the power cables from the connectors on motherboard, graphic card, hard disk drive, solid state drive, optical drive. 1 2 3 4 5 6 Chapter 8 ...

Lenovo Erazer X700Hardware Maintenance Manual - Page 42

Step 7. Remove the 2 screws that secure power supply supporting bracket, remove the bracket and put it aside. 7 Step 8. Remove the 4 screws that secure the Power supply to the chassis. 8 Step 9. Slide then lift the Power supply out of chassis. 9 Step 10. Install the new power supply : a. Line up the holes on the new power supply with mounting holes on the rear of the chassis and secure it to the chassis with the 4 screws. b. Reattach the power supply supporting bracket. c. Connect the power cables to the connectors on the motherboard, graphic card, hard disk drive, solid state drive, opti..

Replacing the Wi-Fi card - Page 43

d. Reattach the heat-sink assembly. Step 11. Reattach the computer cover. Replacing the Wi-Fi card Note: For this procedure, it helps to lay the computer flat. To replace the Wi-Fi card: Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating system, and turn off the computer and all attached devices. Step 2. Unplug all power cords from electrical outlets. Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer. Refer to “Left and righ..

Lenovo Erazer X700Hardware Maintenance Manual - Page 44

Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating system, and turn off the computer and all attached devices. Step 2. Unplug all power cords from electrical outlets. Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer. Refer to “Left and right view” and “Rear view” for help with locating the various connectors. Step 4. Remove the computer cover. Refer to “Removing the computer cover”. Step 5. Remove the front bezel...

Chapter 8 - Page 45

Step 7. Slide to left to unlock the front card reader module. 2 Step 8. Open the front door, then slide out the card reader tray as shown. 3 4 Chapter 8 . Replacing hardware 39

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Lenovo Erazer X700Hardware Maintenance Manual - Page 46

Step 9. Remove the front card reader module top cover as shown. 5 6 Step 10. Remove the 4 screws that secure the card reader module to the bracket, remove the card reader module as shown. 7 8 Step 11. Install the new front card reader module: a. Line up the new front card reader module with the card port, and then insert the new card reader module into position. b. Secure the new card reader module with the four screws. c. Connect the data cables to the new card reader module. d. Reattach the card reader top cover and secure it with the screws. e. Line up the card reader tray with the guide..

Replacing the front I/O board - Page 47

To replace the motherboard: Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating system, and turn off the computer and all attached devices. Step 2. Unplug all power cords from electrical outlets. Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer. Refer to “Left and right view” and “Rear view” for help with locating the various connectors. Step 4. Remove the computer cover. Refer to “Removing the computer cover”. Ste..

Lenovo Erazer X700Hardware Maintenance Manual - Page 48

Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating system, and turn off the computer and all attached devices. Step 2. Unplug all power cords from electrical outlets. Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer. Refer to “Left and right view” and “Rear view” for help with locating the various connectors. Step 4. Remove the computer cover. Refer to “Removing the computer cover”. Step 5. Remove the graphic card..

Chapter 8 - Page 49

Step 10. Disconnect the front I/O module cables from the connectors on the motherboard. Step 11. Remove the 2 screws that secure front I/O module to the chassis, then slide out the front I/O module and cables slowly. 7 8 Chapter 8 . Replacing hardware 43

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Lenovo Erazer X700Hardware Maintenance Manual - Page 50

Step 12. Remove the 2 screws that secure the front I/O board to the bracket, and then slide the front I/O board out as shown. 9 Step 13. Install the new front card reader module: a. Line up the new front I/O board with the bracket, then secure the front I/O board to the bracket with the 2 screws. b. Slide the new front I/O board module and cables into position. c. Secure the new front I/O board to the chassis with the 2 screws. d. Reattach the top cover. e. Reattach the power supply, heat-sink, graphic card. Step 14. Reattach the computer cover. FRU lists This chapter lists the information ..

Chapter 8 - Page 51

I I7-3820 3.6/1600/10/2011 130 M1 CPU 1100509 N System board NON_WIN8 MSI X79 MATX MB 90001926 N WIN8 MSI X79 MATX MB 90001927 N WIN8_PRO MSI X79 MATX MB 90001928 N Thermal module MSI 35-101-1012170 cooler 31503169 N DS12025B12HP076 Fan 31503170 N Memory M378B5273DH0CK0 4GB D31600 Memory HF 1100213 2 Hard drives SGT Grenada ST1000DM003 1TB HDDLH 16200182 2 SGT Grenada ST2000DM001 2TB HDDLH 16200184 2 Samsung PM830 MZ7PC128HAFU-000L5 128G SSDLH 16200261 2 Optical drives PLDS 16XDH16ACSH SATA DVDRWLH 25201626 2 HLDS 16XGHA2N SATA DVDRW-LH 25210650 2 HLDS 16XGH82N SATA DVDRWLH 25013549 2 HLDS ..

Lenovo Erazer X700Hardware Maintenance Manual - Page 52

Keyboard and mouse Sunrex EKB-10YA(JP) B-Silk USB KB-LVT8 25209135 1 Liteon LXH-SM-8825 B-Silk Mouse 25-200528 1 Chicony LXH-MSU-1111 B-Silk Mouse 25-200529 1 Sunrex LXH-EMS-10ZA B-Silk Mouse 25-200530 1 Power cord 豪利士 1.8 米 C13 JAPAN Power Cord 31049514 1 立讯 ( 博硕 )1.8 米 C13 JAPAN Power Cord 31049523 1 LW 1.8m JAPAN Power Cord® 31039730 1 豪利士 1.8 米 C13 JAPAN Power Cord 31049514 1 立讯 ( 博硕 )1.8 米 C13 JAPAN Power Cord 31049523 1 LW 1.8m JAPAN Power Cord® 31039730 1 46 Lenovo Erazer X700Hardware Maintenance Manual

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Additional Service Information - Page 53

Chapter 9. General information This chapter provides general information that applies to all machine types supported by this publication. Additional Service Information This chapter provides additional information that the service representative might find helpful. Power management Power management reduces the power consumption of certain components of the computer such as the system power supply, processor, hard disk drives, and some monitors. Advanced configuration and power interface (ACPI) BIOS As this computer has an ACPI BIOS system, the operating system is allowed to control the powe..

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