Service manual

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Troubleshooting
4 – 16
error beeps
POST ERROR BEEPS & SCREEN MESSAGES
Errors, fatal or non-fatal, can occur during the POST. All fatal errors and some non-fatal errors are communicated
through a series of audible beeps. Table 4-4 below lists the error beep messages. Fatal errors do not allow the system
to continue the boot process.
Most displayed errors as listed in Table 4-5 (pages 4-17 to 4-19) and Table 4-6 (pages 4-20 to 4-23), allow the system
to continue the boot process. The system will halt after one of the screen messages and cannot usually be rebooted
until a physical change is made in the system.
For most errors there will be only one message displayed. However, a second message may appear: RUN SETUP. If
this message occurs, press F2 to run Setup.
TABLE 4 – 4
FATAL ERROR MESSAGES
Error Code Beep Sequence Description
16 1-2-2-3 BIOS ROM checksum
20 1-3-1-1 Test DRAM refresh
22 1-3-1-3 Test 8742 Keyboard controller
2C 1-3-4-1 RAM failure on address line xxxx
2E 1-3-4-3
RAM failure on DATA bits xxxx of low byte
of
memory bus
30 1-4-1-1 RAM failure on DATA bits xxxx of high type of memory bus
46 2-1-2-3 Check ROM copyright notice
58 2-2-3-1 Test for unexpected interrupts
each beep group is separated by a pause