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Beep Symptom
1 long and 2 short beeps Monitor or video adapter card
error
1 long and 3 short beeps Keyboard error
1 long and 9 short beeps BIOS ROM error
Continuos 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.
POST Error Message
CMOS battery failed
CMOS checksum error - defaults loaded
60
ThinkCentre Hardware Maintenance Manual
FRU/Action
Perform the following actions in order.
1. Make sure the monitor is properly connected to the
computer.
2. Replace the video adapter card (if present).
3. Replace the system board.
Perform the following actions in order.
1. Make sure the keyboard is properly connected to the
keyboard connector.
2. Replace the keyboard.
3. Replace the system board.
Perform the following actions in order.
1. Start the Setup Utility program and press F7 to
load defaults and then press F10 to Save and exit.
See Chapter 6 "Diagnostics, Test and Recovery
Information" on page 37.
2. Perform a Boot block recovery. See "Updating
(flashing) BIOS from your operating system" on page
92.
3. Replace the system board.
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.
Description/Action
The CMOS battery is no longer functional.
Replace the battery.
Checksum of CMOS is incorrect.
The computer loads the default configuration settings.
This error might indicate that CMOS has become corrupt
due to a weak CMOS battery.
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