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The tables below list the possible error messages and tone
codes.
Power-on diagnostic error messages
Message
Shutdown failure
Gate A20 failure
Unexpected interrupt in
protected mode
Decreasing available memory
Timer chip counter 2 failed
Time-of-day clock stopped
Power-on diagnostic error tone codes
Error tone
Description
1-1-3
1-1-4
1-2-2
DMA
l-2-4
Invalid SIMM combination installed
1-3-o
VGA RAMDAC failure
1-3-1
RAM refresh verification failure
1-3-2
Wrong memory installation
1-3-3
First 64KB RAM chip or data line failure (multi-bit)
1-3-4
First 64KB RAM odd/even logic failure
1-4-1
First 64KB RAM address line failure
l-4-2
First 64KB RAM parity test failure
l-4-3
Fail-safe timer test failure
l-4-4
Software NMI port test failure
Time-of-day clock could not be read
page register write/read failure
Description
Shutdown failure
Gate A20 failure
Unexpected interrupt in protected
mode
RAM failure above address OFFFFh
Troubleshooting C-3
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