Help, my computer keeps crashing and it seems to be linked to the sound card or the VGA driver (I think). I have turned off the audio device which seem to help for a while, but if I play games or try to use either of the cd drives for downloading from CD onto the computer, the computer just turns itself off and starts alarming (sounds like a police siren). I have to turn it off at the socket and then switch it back on after 10 secs to get it to work again - could this be a power supply problem? I have recently had a new hard drive fitted as thought this was the problem, but if anything, the situation is worse. I have only installed minimum stuff on the computer since the new hard drive was installed - any help gratefully received. Thanks