Just to provide an update -- the current status is that the beep is not occurring atm, but it has been just a little cooler. If I get a chance, I'll take that machine down and clean out any dust and such, or, if the beeping resumes I'll try some of the ideas suggested here.
As an aside, the machine is a desktop machine, so no charger is involved. I do have it on a UPS, but there is no serial (or USB) cable connected from the UPS to the desktop, and the sound definitely comes through the computer speakers, so I'm about 99% sure the beep is not coming from the UPS. On Thursday, May 09, 2019 09:05:54 PM David Wright wrote: > On Thu 09 May 2019 at 20:46:34 (+0200), Jan Claeys wrote: > > On Thu, 2019-05-09 at 09:56 +0000, Curt wrote: > > > In the event there is no functional motherboard speaker, I guess it > > > cannot be a BIOS alarm of any kind. > > > > Some on-board audio chips are wired up so that they can emulate old > > school IBM PC compatible motherboard speakers/buzzers. > > > >From the log¹ for my Dell D430 laptop: > "2010-04-23 One of the Dell chargers started to beep very quietly to > itself. Although it was powered, the green light was out. Switching it > on would make the green light come on for a few seconds, then it would > go back to beeping." > > It was one of those sledge-shaped chargers with the peculiar > backward-facing figure-8 plug on its cord; the IT dept > replaced it. Four years later, the last battery gave out, > and the charging circuitry too. Now the laptop only runs on > a charger, and needs a monitor too because the screen blanks > itself most of the time. > > ¹ typed by me, not the machine-generated ones. > > Cheers, > David.