Beep Codes
If POST can display a message on the video display screen, it
causes the speaker to beep twice as the message appears.
However, POST cannot display messages when an error occurs
before the video display is initialized. Instead, it emits a series of
beeps.
Note: If you do not hear any beep codes, check Setup or the ECU,
if possible, to see if the speaker has been disabled. If it is
disabled, change the option to enabled.
For example, a failure of bit 3 in the first 64K of RAM is
indicated by a 214 beep code (a burst of two beeps, a single beep,
and a burst of four beeps). In addition, POST writes a value of
13H to I/O port 80H to enable debugging tools to identify the
area of failure.
The following tables list the beep codes and the values that POST
writes to I/O port 80H when it encounters error conditions. The
first table lists fatal errors (errors that halt the system). The
second table lists the nonfatal errors (errors that are not serious
enough to halt the system). Both tables list other conditions that
have no beep codes.
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Problem Solving
