Post Error Codes - Lenovo ThinkCentre M73 10B0 Hardware Maintenance Manual

The following table describes the beep symptoms.
Beep symptom
2 short beeps Common POST 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
1820
1962
64
ThinkCentre M73 Hardware Maintenance Manual
FRU/Action
Common error code, see the detail failure information in
"POST error codes" on page 64.
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
More than one external fingerprint
reader are attached. Power off and
remove all but the reader that you set
up within your main operating system.
No operating system found. Boot
sequence will automatically repeat.
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.
If more than one external fingerprint
reader are connected to a computer,
this error message will be displayed
to inform you to remove all of the
fingerprint keyboards except the
one compatible with the fingerprint
application on your computer.
This error occurs only after the POST
is completed. Boot sequence will
automatically repeat.