Beeping after power irregularities?
Our AC power just blinked several times. More or less concurrently with
that, something in our server cage (we think it's a Debian box); it
doesn't appear to be an AS/400, any network gear, or our UPS) began
emitting one-second beeps, approximately every two seconds (i.e., a
one-second beep alternating with a one-second silence).
James H. H. Lampert