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Appendix A BIOS Error Codes
Appendix A
BIOS Error Codes
A.1 BIOS Error Beep (POST) Codes
During the POST (Power-On Self-Test) routines, which are performed each time the system
is powered on, errors may occur.
Non-fatal errors are those which, in most cases, allow the system to continue the boot-up
process. The error messages normally appear on the screen.
Fatal errors are those which will not allow the system to continue the boot-up 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 table
below lists some common errors and their corresponding beep codes encountered by users.
BIOS Error Beep (POST) Codes
Beep Code Error Message Description
1 short Refresh Circuits have been reset (Ready to power up)
5 short, 1 long Memory error No memory detected in system
5 long, 2 short Display memory read/write error Video adapter missing or with faulty memory
1 long continuous System OH System overheat condition
A.2 Additional BIOS POST Codes
The AMI BIOS supplies additional checkpoint codes, which are documented online at http://
www.supermicro.com/support/manuals/ ("AMI BIOS POST Codes User's Guide").
When BIOS performs the Power On Self Test, it writes checkpoint codes to I/O port 0080h.
If the computer cannot complete the boot process, a diagnostic card can be attached to the
computer to read I/O port 0080h (Supermicro p/n AOC-LPC80-20).
For information on AMI updates, please refer to http://www.ami.com/products/.
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