Hi Guys,

My pc (approx 2 1/2 years old)started overheating a couple weeks ago, shutting down, fan whirring up and restarting, also showing a cpu temp of about 60deg C. I took the case off and gave fans, case vents etc a going over with compressed air which seemed to fix the problem. A couple nights ago same thing happened and on restarting it couldnt get into windows without it shutting down on me. It will however work fine with the case off so i can only assume its an overheat problem. I picked up a new cpu fan and fitted it today, (no problems like a glove), but on turning my computer on it fired up first time ok for a couple minutes then froze completly. Trying to restart it the only life it showed was the fans going. After a bit of head scratching and beer drinking, I refitted the old cpu fan and it is back up and running again (with side case off),but on start up got a message saying overclocking failed?? Any thoughts? i've changed basic components before and never had anything like this happen. Cpu is Intel Core 2 Q9550 quad 2.83ghz, and if it matter 4gb ddr2 ram, Radeon 4800 series graphics card, 1TB hard drive.

Any advice appreciated