Power Supply Problems; Beep Symptoms; Post Error Codes - Lenovo ThinkCentre M700 Hardware Maintenance Manual

Error
The boot sector on the startup drive is corrupted.
The drive is defective.

Power supply problems

If you suspect a power problem, use the following procedures.
Check/Verify
Check the following for proper installation.
• Power cord
• On/Off switch connector
• On/Off switch power supply connector
• System board power supply connectors
• Microprocessor(s) connection
Check the power cord for continuity.
Check the power-on switch for continuity.

Beep symptoms

Beep symptoms are tones or a series of tones separated by pauses (intervals without sound) during POST.
The following table describes the beep symptoms.
Beep symptom
2 short beeps CMOS setting error
3 short and 1 long beeps DRAM memory error

POST error codes

Each time you power-on the system, it performs a series of tests that check the operation of the system
and some options. This series of tests is called the Power-On Self-Test, or POST. POST does the following
operations.
• Checks some basic system-board operations
• Checks the memory operation
• Starts the video operation
• Verifies that the boot drive is working
FRU/Action
The drive must be formatted. Do the following:
1. Attempt to back up the data on the failing hard disk
drive.
2. Using the operating system programs, format the
hard disk drive.
Replace the hard disk drive.
FRU/Action
Common error code, see the detail failure information in
"POST error codes" on page 83.
Perform the following actions in order.
1. Make sure the memory module(s) are properly seated
in the connector(s).
2. Replace the memory module(s).
3. Replace the system board.
.
Chapter 8 Service checkout and symptom-to-FRU index
FRU/Action
Reseat connectors
Power cord
Power-on switch
83