Beep Symptoms; Post Error Codes - Lenovo ThinkCentre M77 Hardware Maintenance Manual

Diagnostic Error Code
305-000-XXX Monitor DDC Test Passed
305-250-XXX Monitor DDC self test failure
415-000-XXXModem Test Passed
415-XXX-XXX Modem error

Beep symptoms

Beep symptoms are tones or a series of tones separated by pauses (intervals without sound) during the POST.
The following tables describes beep symptoms.
Beep Symptom
3 short beeps and 1 long beep Memory not detected
2 short beeps Common POST Error

POST error codes

Each time you Turn 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. The 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.
POST Error code POST Error message
00CE Machine Type or Serial Number is INVALID
0210 Stuck key
FRU/Action
No action
1. Run Setup to enable DDC
2. Cable
3. Monitor
4. Video card
5. System board
No action
Remove the Modem and re-test the system
FRU/Action
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.
Indicates that an error has occurred during the POST.
Description/Action
This error message is displayed when the machine
type or the serial number is invalid.
This error message is displayed during the POST
when a key is kept pressed for a long time.
Chapter 7
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Symptom-to-FRU index
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