Hi, I've been recently having an issue with my PC that has got me completly stumped. When it's been turned on for around 30 minutes everything becomes extremely laggy, sound, picture, mouse, until nothing will either open or close. Task manager wont open, I cant shut down/reboot ect ect. After a hard reset it will take around 10 minutes to get past the windows loading screen and 9 times ouit of 10 i will have the same problem (mouse lagging everywhere until nothing will open) if i get that far. Sometimes to fix the issue i have to hard reset the PC and unplug power to the machine, and i usually leave it for around 10 minutes and then it boots up its fine. Although this doesnt fix it 100% of the time and sometimes it's just down to pot luck. If i check the event viewer i can see an entry just before i have the problem that says ; "Event 4, Kernel-Processor-Power" (one for each core) I've searched around for anything that could shed any light on this problem and have found nothing, so i thought i would bring it here. PC Spec Windows Ultimate x32 2x 8800GTX 2GB RAM Q6600 @ 3.00ghz nForce 780i SLI Any help is appreciated. Regards, Lee.