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Appendix B: Beep and POST Codes
M54E2 System Board Manual
Beep and POST Codes
Beep codes are a series of beeps sent through the speaker that indicate
a problem during the Power On Self Test (POST). If text appears on
the video screen, the M54E2 has completed POST; any other tone
from the speaker indicates something other than a POST error. These
tones are not described in Table B-1.
The beep error codes are a series of beeps. The duration of the beep
tones are constant, but the length of the pauses between the beeps
varies. For example: a 1-3-3 beep code will sound like one beep, a
pause; three beeps consecutively, another pause; and then three more
beeps.
One beep code is often misunderstood. If a video card is not installed
or is failing, the system board will generate a long-short-long-short
beep code. This is often interpreted as a 1-2-1 beep code. But POST
errors always vary in the length of the pause and not the duration of
the beep tone.
Another way of identifying a POST error is to use a device called a
POST card. This peripheral card is inserted into one of the ISA slots
and has an LED (or LCD) read out showing the contents of port 80h.
The tables on the following page provides a list of all beep codes and
POST routines.
B-1
B