Maintenance and Troubleshooting 4-9
Problems and Solutions
Problem Symptom Solution
Communication error No or bad data when
communicating.
Check cable connections between the
system board and device.
Check that the interface port is selected.
Test or replace the device and interface
cable (see the device documentation for
troubleshooting).
Replace the system board.
Beep Codes
During boot up, the computer performs a series of POST (Power On Self Test)
routines. A beep code may appear when an error is detected. There are fatal and
nonfatal errors. The fatal errors include BIOS, CMOS, DMA, RAM, video, and
keyboard controller errors. The nonfatal errors include timer tick interrupt,
shutdown test, unexpected interrupt in protected mode, gate A20, RAM test,
interval timer channel 2 test, clock, serial and parallel port test, numeric
processor, system board select, and extended CMOS RAM.
The following table describes the beep codes.
Beep Code Descriptions
Beeps Description
1-2 Search for option ROMs
1-2-2-3 BIOS ROM checksum
1-3-1-1 Test DRAM refresh
1-3-1-3 Test keyboard controller
1-3-3-1 Autosize DRAM
1-3-3-2 Initialize POST memory manager
1-3-3-3 Clear 512 KB base RAM
1-3-4-1 RAM failure on address line xxxx
1-3-4-3 RAM failure on data bits xxxx of low byte of memory bus
1-4-1-1 RAM failure on data bits xxxx of high byte of memory bus
2-1-2-2 POST device initialization
2-1-2-3 Check ROM copyright notice
2-2-3-1 Test for unexpected interrupts
2-2-4-1 Test RAM between 512 KB and 640 KB
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