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APPENDIX F - BIOS ERROR BEEP CODES
During the POST (Power On Self Test) routines, which are performed each time the system is powered
on, errors may occur.
Nonfatal 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 MCSI Customer Service for possible repairs.
These fatal errors are communicated through a series of audible beeps. The numbers on the fatal error
list below correspond to the number of beeps for the corresponding error. All errors listed, with the
exception of number eight, are fatal errors.
No. of Beeps Error Message
1 Refresh Failure - The memory refresh circuitry is faulty.
2 Parity Error - A parity error was detected in the first 64K block of system memory.
3 Base 64KB Memory Failure - A memory failure occurred within the first 64KB of
memory.
4 Timer Not Operational - Timer #1 has failed to function properly.
5 Processor Error - The CPU chip has generated an error.
6 8042-Gate A20 Failure - The keyboard controller (8042) contains the Gate A20
switch which allows the CPU to operate in virtual mode. This error message means
that the BlOS is not able to switch the CPU into protected mode.
7 Processor Exception lnterrupt Error - The CPU chip has generated an exception
interrupt.
8 Display Memory Read /Write Error - The video adapter is either missing or the
video memory is faulty. PLEASE NOTE: This is not a fatal error.
9 ROM Checksum Error - The ROM checksum value does not match the value
encoded in the BIOS.
10 CMOS Shutdown Register Read/Write Error - The shutdown register for the CMOS
memory has failed.
11 Cache Memory Read/Write Error - A Cache Memory failure occurred, do not enable
the Cache Memory to resume operation.