On Tue, Mar 06, 2018 at 10:50:52AM -0800, James H. H. Lampert wrote:
> 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).
Find the model number of the computer (guessing it's a rack-mounted server
of some kind) and find its manual and see if it has diagnostic beep codes.