A-1
Appendix A: BIOS POST Error Codes
Appendix A
BIOS Error Beep Codes
During the POST (Power-On Self-Test) routines, which are performed at each
system boot, errors may occur.
Non-fatal errors are those that, in most cases, allow the system to continue to
boot. The error messages normally appear on the screen.
Fatal errors will not allow the system to continue with bootup procedure. If a fatal
error occurs, you should consult with your system manufacturer for possible repairs.
The fatal errors are usually communicated through repeated patterns of audible
beeps. Each pattern of audible beeps listed below corresponds to its respective
error.
A-1 BIOS Error Beep Codes
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 No Con-
Out devices
Con-In includes USB or PS/2 key-
board, PCI or Serial Console Redirec-
tion, IPMI KVM or SOL.
Con-Out includes Video Controller,
PCI or Serial Console Redirection,
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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