I decided upgraded my video card yesterday and at the same time gave my cpu fan a clean. When I tried to boot up the computer it loaded OK and when I got to the desktop it just turned it self off??? I have been trying to work out the problem ever since....the scary thing is that I reinstalled the old video card and it doing the same thing? When I cleaned the cpu fan I actually diconnected it from the board and I am wondering if that has something to do with it? The fan works OK. It seems to lose power...there are no beeps telling me there is an error..which is something someone suggested I should look out for? Running WIndows Xp Pentium 4. Any suggestions would be greatly appreciated.