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Service Reference Guide 483941-001 C–1
C
POST Error Messages
An error message results if the Power-On Self-Test (POST) encounters a problem. This test runs
when the system is turned on, checking assemblies within the computer and reporting any errors
found.
Not all computers use all of the codes listed.
Recommended Actions are to be taken in incremental steps. Perform one step at a time and
continue only if the action does not cure the problem.
POST Error Messages
Screen Message Probable Cause Recommended Action
BIOS ROM checksum
error - System halted
The checksum of the BIOS
code in the BIOS chip is
incorrect, indicating the
BIOS code may have
become corrupt.
Replace the BIOS
CMOS battery failed The CMOS battery is no
longer functional.
Replacement battery.
CMOS checksum error -
Defaults loaded
Checksum of CMOS is
incorrect, so the system
loads the default
equipment configuration.
A checksum error may
indicate that CMOS has
become corrupt. A weak
battery may have caused
this error.
Check the battery and replace if
necessary.
CPU at xxxx Displays the running
speed of the CPU.
Not an error, no action request
Press ESC to skip
memory test
A remind message, not
an error.
The user may press Esc to skip the full
memory test.
HARD DISK INSTALL
FAILURE
Cannot find or initialize
the hard drive controller
or the drive.
Make sure the controller is installed
correctly. If no hard drives are installed,
be sure the Hard Drive selection in Setup
is set to NONE.