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POST beep codes
The following table lists the error beep codes. Prior to system video initialization, BIOS uses these beep codes to inform users of error conditions. The beep code occurs only when a critical error occurs or when the BIOS fails to boot to the operating system. Not all error conditions are supported by the BIOS beep codes.
Number of
beeps
Description
1Memory refresh timer error
2Parity error in base memory (first 64KB block)
3Base memory read/write test error
4Timer not operational
5Processor failure
68042 GateA20 cannot be toggled (memory failure or not present)
7 | Exception interrupt error |
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8 | Display memory R/W error |
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9 | ROM checksum error |
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10 | CMOS shutdown register test error |
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11 | Cache memory test failed |
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