Hi all, I'm almost at the end of my tether. My pc randomly locks up, with no warning. It can lock up just after booting, when i'm browsing the net, playing games, downloading, or just sat doing nothing. Theres no pattern to it, it can happen anytime, after boot up. Hot, cold, warm whatever, there's no way of knowing. But I'm really pissed off. I've replaced the motherboard, power supply, hard drive, graphics card and it's still happening. Can anyone out there help me? Pleeeeease? I've asked advice from pc shops and they're scratching their heads. When it locks up/freezes, whatever was showing on the screen freezes, if there was music playing it just cuts off, the fans are still working and so to is the mouse. but nothing else works, Both the power and hard drive lights are on permanatly. I have to press and hold down the power switch and turn it off and back on again. Starts up no problem. I don't even get it switching to safe mode. Starts up normally and can work for hours or minutes. The mb is a asrock p4vm890. All drivers are upto date. Thanks for any help in this matter.