Acer Altos G330 Series - Manual (Page 95)

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Error Manager
Every time the server is powered on, it performs a series of diagnostic
tests that checks firmware and assemblies to ensure that the server is
properly functioning. This is referred to as Power–On Self–Test or
POST. If POST detects an error, it either displays an error message or
emits a beeping sounds. For more information on POST beep codes, go
to page 94.
In instances of a non-critical POST failure, an error message describing
the problem appears onscreen. These text messages are displayed in
normal video (white text on black background). It shows the error
details, and sometimes even a possible action to resolve the error.
These POST errors are recorded by the Error Manager.