[Cornboy69]

Hello all,
I have a 2.4ghz, 512ram, ati9800 128 meg vid card, 120gig serial ata, xp pro rig.
Everything was running fine for the last 5 months, then recently my pc started shutting down for no reason. Sometimes I would be on for an hour, sometimes for 20 seconds after boot.

Now it gives me the dreaded insert system disk upon first boot, then if I do a soft boot it will bring me into xp and shut down at a random interval. I unplugged and replugged everything in just in case it got unseated.
I havent upgraded anything, only software I added was Doom 3 and I have played it for over 2 weeks without a glitch.
I ran antivirus with nothing to report.

Could it be my power supply is going? My hard drive? It just seems so random I cant make sense of it. My fans are all operating correctly and my cpu temp is 45-48c at all times.

One odd thing, my pc does work better if i turn it on its side, but cant load any cds...

Any ideas at all? Many thanks!
John