Hi, Im new & dont know too much about computers. Heres my problem: I have an AMD Athlon XP 2400+ & whenever i play games it restarts itself, i deceided to see what temps i was getting after it restarted & they where in the 80's. So i bought myself a new heatsink & fan (http://by101fd.bay101.hotmail.msn.c...8bea018dbb4c2881ac6a9c04fdf4c4a6207c6e6731db6) When i tried to install the heatsink & fan i noticed that the new one was bigger than the old one but it fitted so i carried on anyways, once it was installed i tried to boot up the screen did not come on, so i tried fitting the H & F the other way, but still with no luck. So i took off the new H & F and fitted the old one, but when i tried to boot the power would come on for a few seconds and then switch off. I really dont know what to do, i dont have any power on my pc & am thinking of buying a new one, but would rather save myself the money & get this one fixed..