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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).

Any insights?

James H. H. Lampert