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5 Power-On Self-Test and Error Messages
Beep Codes
Beep Codes
If a terminal error occurs during POST, the system issues a beep code before
attempting to display the error. Beep codes are useful for identifying the
error when the system is unable to display the error message.
Lights on the Status Panel
When the computer is first powered on, the power-on light on the status
panel illuminates yellow for about a second before changing to green. This
change of color is caused by the execution of an instruction early in the
System BIOS code.
If the light remains at yellow, therefore, it indicates a failure of the processor
or the System ROM in the instruction-fetch process. Check that the
processor is correctly seated in its socket, and that its VRM is also correctly
seated.
1.
Where digits 1, 2, 3, 4 represent the number of short beeps, and 0
represents the occurrence of a single long beep.
Beep Pattern
Beep
Code
1
Numeric
Code
Description
- 1 B4h This does not indicate an error. There is one short beep before
system startup.
—
- - 02 98h Video configuration failure or option ROMs check-sum failure
—
- - - - - - - 0223 16h BIOS ROM check-sum failure
—
- - -
—
—
0300 20h DRAM refresh test failure
—
- - -
—
- - -
0303 22h 8742 Keyboard controller test failure
—
- - -
- - - - —
0340 2Ch RAM failure
—
- - - - - - - - - - 0343 2Eh RAM failure on data bits in low byte of memory bus
—
- - - -
—
—
0400 30h RAM failure on data bits in high byte of memory bus
- - —
- - - - - 2023 46h ROM copyright notice check failure
- - - - - - - —
2230 58h Unexpected interrupts test failure
—
- -
—
- - - - 02022 Continuous beeps. Keyboard error
