Lenovo ThinkCentre M71z, Hardware Maintenance Manual

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Diagnostic Error Code FRU/Action
305-000-XXX Monitor DDC Test Passed
No action
305-250-XXX Monitor DDC self test failure 1. Run the Setup Utility program to enable DDC.
2. Cable
3. Monitor
4. Video card
5. System board
415-000-XXX Modem Test Passed No action
415-XXX-XXX Modem error Remove the Modem and re-test the system.
Beep symptoms
Beep symptoms are tones or a series of tones separated by pauses (intervals without sound) during POST.
The following tables describes 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 79.
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
If the POST detects a problem, an error message appears on the screen. A single problem can cause several
error messages to appear. When you correct the cause of the first error message, the other error messages
probably will not appear on the screen the next time you turn on the system.
Chapter 7
.
Symptom-to-FRU Index
79