Gateway ALR 9250R User Manual page 139

After POST completes, the system beeps once.
What appears on the screen after this depends on if you have an OS loaded
and if so, which one.
If the system halts before POST completes running, it emits a beep code
indicating a critical system error that requires immediate attention. If POST
can display a message on the video display screen, the speaker beeps twice
as the message appears.
Note the screen display and write down the beep code you hear; this
information is useful for your service representative. For a listing of beep
codes and error messages that POST can generate, see "Solving problems"
on page 155.
Chapter 6: Other Utilities 125