This is what a friend just told me: I have a Pentium II 233. When it has run for an hour or two It starts to beep continuosly but everything still works fine. I shut it down for 10 minutes, start it up and it is OK for another hour, then it starts to beep again.
The beep does not come from the speaker but somewhere inside the "box".
I am going there to see for myself but thought I would get some insite first. Any clues?