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Beep Symptom FRU/Action
1 long and 9 short beeps BIOS ROM error
Perform the following actions in order.
1. Start the Setup Utility program and press F9 to load
defaults and then press F10 to Save and exit. See
Chapter 6 “Using the Setup Utility” on page 43
.
2. Perform a Boot-block recovery. See “Recovering
from a POST/BIOS update failure” on page 560.
3. Replace the system board.
Four sets of three 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
• 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 Message Description/Action
CMOS battery failed The CMOS battery is no longer functional.
Replace the battery.
CMOS checksum error - defaults loaded Checksum of CMOS is incorrect.
The computer loads the default conguration settings.
This error might indicate that CMOS has become corrupt
due to a weak CMOS battery.
CPU at nnnn
nnnn is the running speed of the microprocessor.
Press Esc to skip memory test
Pressing Esc skips the full memory test
HARD DISK INSTALL FAILURE Cannot nd or initialize the hard disk drive controller or
the drive.
Make sure the hard disk drive is correctly installed.
If no hard disk drives are installed, make sure the hard
disk drive selection in Setup is set to NONE.
66 ThinkCentre Hardware Maintenance Manual