Lenovo B520 Lenovo IdeaCentre B520 Hardware Maintenance Manual - Page 15

General Checkout - memory

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General Checkout 4Chapter 4. General Checkout Attentions 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. Notes • The default is for this computer to boot up in quiet mode (no beep, no memory count and checkpoint code display) when no errors are detected by POST. • Before replacing any FRUs, ensure that the latest level of BIOS is installed on the system. A down-level BIOS might cause false errors and unnecessary replacement of the system board. Use the following procedure to help determine the cause of the problem: 1. Power-off the computer and all external devices. 2. Check all cables and power cords. 3. Set all display controls to the middle position. 4. Power-on all external devices. 5. Power-on the computer. • Look for displayed error codes • Look for readable instructions or a main menu on the display. If you did not receive the correct response, proceed to step 6. If you do receive the correct response, proceed to step 7. 6. Look at the following conditions and follow the instructions: • If the computer displays a POST error, go to "POST error codes". • If the computer hangs and no error is displayed, continue at step 7. 7. If you cannot continue, replace the last device tested. 13

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Chapter 4. General Checkout
13
General Checkout
4
Attentions
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.
Notes
• The default is for this computer to boot up in quiet mode (no beep,
no memory count and checkpoint code display) when no errors are
detected by POST.
• Before replacing any FRUs, ensure that the latest level of BIOS is
installed on the system. A down-level BIOS might cause false errors
and unnecessary replacement of the system board.
Use the following procedure to help determine the cause of the problem:
1. Power-off the computer and all external devices.
2. Check all cables and power cords.
3. Set all display controls to the middle position.
4. Power-on all external devices.
5. Power-on the computer.
•
Look for displayed error codes
•
Look for readable instructions or a main menu on the display.
If you did not receive the correct response, proceed to step
6
.
If you do receive the correct response, proceed to step
7
.
6. Look at the following conditions and follow the instructions:
•
If the computer displays a POST error, go to
“POST error codes”
.
•
If the computer hangs and no error is displayed, continue at step
7
.
7. If you cannot continue, replace the last device tested.