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Appendix A: BIOS POST 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 which, 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.
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 corresponding 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 No
Con-Out devices
1 beep per device
Refresh
1 Continuous Beep
System OH
Con-In includes USB or PS/2
keyboard, PCI or Serial Console
Redirection, IPMI KVM or SOL.
Con-Out includes Video Controller,
PCI or Serial Console Redirection,
IPMI SOL.
1 beep or each USB device detected
IPMI Error Codes
System Overheat
A-1