Post Error Codes - Lenovo ThinkCentre M73z Hardware Maintenance Manual

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
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.
Error code
0135
0211
0164
1762
60
ThinkCentre M73z Hardware Maintenance Manual
FRU/Action
Common error code, see the detail failure information in
"POST error codes" on page 60.
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 message
Fan failure
Keyboard not found
Memory size decreased
Configuration change has occurred
Description/Action
The system might be overheating.
Press F10 to exit.
Note: If the problem is caused by the
microprocessor fan, press F10 will
not solve the problem.
When there is no keyboard detected,
the error message will be displayed.
Press F10 to exit.
This error message is displayed when
a hard disk drive or optical drive
change has been made.
Press F10 to exit.