Lenovo ThinkCentre E73z, Hardware Maintenance Manual, Page: 64 / 124

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 60.
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.
Error code POST error message Description/Action
0135 Fan failure 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.
0211
Keyboard not found
When there is no keyboard detected,
the error message will be displayed.
0164 Memory size decreased Press F10 to exit.
1762
Configuration change has occurred
This error message is displayed when
a hard disk drive or optical drive
change has been made.
Press F10 to exit.
60
ThinkCentre E73z Hardware Maintenance Manual