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The following tables describes beep symptoms.
Beep Symptom FRU/Action
2 short beeps CMOS setting error
Perform the following actions in order.
1. Start the Setup Utility program and press F10 to
Save and exit. See Chapter 6 “Using the Setup Utility
program” on page 55
.
2. Start the Setup Utility program and press F9 to load
defaults and then press F10 to Save and exit.
3. Perform a Boot-block recovery. See “Recovering
from a POST/BIOS update failure” on page 173
.
3 short beeps and then 1 long beep 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
• Veries 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 rst 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 Description/Action
00CE Machine Type or Serial Number is INVALID
This error message is displayed when the machine
type or the serial number is invalid.
0211
Keyboard not found
This error message is displayed when there is no
keyboard detected.
0135
Fan failure
The system might be overheating.
Press F1 to enter the Setup Utility program.
Then press F10 to save and exit the Setup Utility
program.
Note: If the problem is caused by the
microprocessor fan, pressing F10 will not solve
the problem.
0164 Memory size decreased This error message is displayed when the memory
size has decreased.
Press F1 to enter the Setup Utility program.
Then press F10 to save and exit the Setup Utility
program.
62 ThinkCentre E93 Hardware Maintenance Manual