Troubleshooting guide

Diagnostics and Troubleshooting
Troubleshooting Guide 335795-006 4–5
BIOS Error Messages
Beep Codes
A BIOS beep code indicates that a video error has occurred and
the BIOS cannot initialize the video screen to display any
additional information. This beep code consists of a single long
beep followed by two short beeps. One long beep followed by
three short beeps indicates the system is running in boot block
recovery mode. If there are no video errors, the system goes
directly to POST messages.
POST Messages Procedures
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.
To restore a corrupt BIOS, refer to
Appendix D, “System BIOS” or call
your local HP Call Center for a
diagnosis. For phone numbers of an HP
Call Center near you, visit the following
Web site:
http://www.hp.com/support
.
CMOS battery failed The CMOS battery is no longer
functional. For information on replacing
the battery, refer to Appendix E,
“Replacing the CMOS 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. Replace the battery if
necessary. For more information, refer
to Appendix E, “Replacing the CMOS
Battery.”