My computer, which I have had for about 4 years, running Win 2000, started crashing recently. It works fine for about 45 minutes, then freezes, and after a few seconds the screen goes black with only a frozen cursor arrow. When I switch it off, the NumLock light on the keyboard stays on. This goes off when I switch it off at the PSU.
If I try to reboot it straight away, it doesn't boot properly. If I leave it for a while and switch it off at the PSU, it boots normally and runs for a short while before freezing again.
I think this is a hardware problem, possibly overheating somewhere. Does anyone have a clue of what I should do to fix it? I have run virus checks, which have found nothing. I don't think it is an OS problem as it runs okay from cold. Strangely, it does not beep anymore when booting up.
Any ideas would be appreciated.