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Beep Codes
One beep indicates that the system has completed its power-on self-test. If a long beep or a se-
ries of long beeps occur, power off the computer and try again. If the long beeps persists, see
for the diagnostic beep codes.
Table Section 4-8
The beep codes are announced on the speaker only if a fatal failure is detected. For instance,
three long beeps indicates a failure in the first 64 K of RAM.
Message
Refresh Failure
Parity Error
Base 64 KB Memory Failure
Timer Not Operational
Processor Error
8042 – Gate A20 Failure
Processor Exception Interrupt
Error
Display Memory Read/Write
Error
ROM Checksum Error
CMOS Shutdown Register
Read/Write Error
Cache Error/External Cache Bad
Table Section 4-8 Diagnostic Beep Codes
Beeps
Description of Failure
1
The memory refresh circuit on the system board is
faulty.
2
Parity error in the first 64 KB of memory.
3
Memory failure in the first 64 KB.
4
Memory failure in the 64 KB of memory or timer 1 on
the system board is not functioning.
5
The CPU on the system board generated an error.
6
The keyboard controller may be bad. The BIOS
cannot switch to protect mode.
7
The CPU generated an exception interrupt.
8
The system graphics is either missing or its memory is
faulty. This is not a fatal error.
9
ROM checksum value does not match the value
encoded in the BIOS.
10
The shutdown register for CMOS RAM failed.
11
The external cache is faulty.
Maintenance and Troubleshooting
4-11
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Table of Contents
Troubleshooting
