Lenovo ThinkCentre M900z 10F2, Hardware Maintenance Manual, Page: 91 / 146

Error FRU/Action
The boot sector on the startup drive is corrupted.
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.
The drive is defective. Replace the hard disk drive.
Power supply problems
If you suspect a power problem, use the following procedures.
Check/Verify FRU/Action
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
Reseat connectors
Check the power cord for continuity. Power cord
Check the power-on switch for continuity. Power-on switch
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 FRU/Action
2 short beeps CMOS setting error Common error code, see the detail failure information in
“POST error codes” on page 83.
3 short and 1 long beeps DRAM memory error
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.
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
Chapter 8
.
Service checkout and symptom-to-FRU index
83