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The tables below list the possible error messages and tone
codes.
Power-on diagnostic error messages
Message
Description
1
No timer tick interrupt
1
Timer tick failure
Shutdown failure
Shutdown failure
Gate A20 failure
Gate A20 failure
Unexpected interrupt in
protected mode
Unexpected interrupt in protected
mode
Decreasing available memory
RAM failure above address
OFFFFh
Timer chip counter 2 failed
’
Interval timer channel 2 failure
Time-of-day clock stopped Time-of-day clock could not be read
Power-on diagnostic error tone codes
Error tone Description
~ code
1 1-1-3
/
8KB and real-time clock CMOS write/read failure
I
1 1-1-4
/
BIOS ROM checksum failure
I
1 1-2-1
I
Programmable interval timer failure
I
1 1-2-2
I
DMA initialization failure
I
1 1-2-3
I
DMA page register write/read failure
I
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
Troubleshooting C-3