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Fatal errors that occur during POST are communicated through a series of
beeps. All beep code errors, except beep code 8, are fatal errors and do not
allow the system to continue to boot.
If beep codes occur during POST, check the items in the Problem Checklist
(at the start of this chapter), verify that all the hardware is set up properly
and securely connected, and try rebooting. If you still get a beep code, go to
the section "If You Need Assistance" at the end of this chapter.
Beep Codes are listed in the table that follows.
NUMBER
OF BEEPS
1
2
3
4
5
6
7
8
9
10
11
7-6 Solving Problems
Beep Codes
ERROR
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
DESCRIPTION
The memory refresh circuitry on
the motherboard is faulty.
Parity error in the first 64 KB of
memory.
Memory failure in the first 64 KB.
Memory failure in the first 64 KB of
memory or Timer 1 on the
motherboard is not functioning.
The CPU on the motherboard
generated an error.
The keyboard controller (8042)
may be bad. The BIOS cannot
switch to protected mode.
The CPU generated an exception
interrupt.
The system video adapter is either
missing or its memory is faulty.
(This is not a fatal error.)
The ROM checksum value does
not match the value encoded in the
BIOS.
The shutdown register for CMOS
RAM failed.
The external cache is faulty.
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