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Appendix A: BIOS POST Error Codes
Appendix A
BIOS POST Error Codes
During the POST (Power-On Self-Test) routines, which are performed upon each
system boot, errors may occur.
Non-fatal errors are those which, in most cases, allow the system to continue to
boot. These error messages normally appear on the screen.
Fatal errors will not allow the system to continue with bootup. If a fatal error occurs,
you should consult with your system manufacturer for possible repairs.
These fatal errors are usually communicated through a series of audible beeps.
The numbers on the fatal error list correspond to the number of beeps for the cor-
responding error.
Motherboard BIOS Error Beep Codes
Beep Code/LED Error Message Description
1 beep Refresh Ready to boot
5 short beeps + 1 long beep Memory error No memory detected in the
system
5 beeps No con-in or con-out
devices
Con-in includes USB or PS/2
keyboard, PCI or serial console
redirection, and IPMI KVM or
SOL.
Con-out includes the video
controller, PCI or serial console
redirection, and IPMI SOL.
1 beep per device Refresh 1 beep for each USB device
detected
IPMI Error Codes
1 Continuous beep System OH System overheat
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