My XP Home desktop computer had been running for about an hour, this morning, when it suddenly started to emit a continuous, non-stop beeeeeeep from inside the main cabinet. I wasn't doing anything on it at the time, and it was just sitting at the desktop.
I tried to shut it down normally, but nothing that I clicked worked. I therefore shut down with the main power button.
I've now restarted and everything seems normal - no beeping noise.
woodchip - when I cleaned the heatsink, I didn't take it off the CPU die - just removed the fan, vacuumed out the dust from between the fins, then put the fan back on. Do you think I should still take it off and apply new paste?
DieSse - what might cause such a voltage fluctuation, please?
Curiously, the computer's been on all day, without any repeat of the noise.
One continuous beep on IBM BIOS indicates Power supply, system board, or keyboard problems. If it's a one of occurance it might not be a concern but if it repeatedly occurs then the first thing I would suspect would be a faulty PSU, these can get clogged up with dust over time and fail.