PC turns itself off after 5 minutes

[gdoggr]

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.

 

[TekGun]

When you took off the cpu fan did you also take off the heatsink? If you did really you should have cleaned off the thermal paste and applied some new. If you didnt then it could be you've disturbed the heatsink from the cpu, what im thinking is your cpu is now getting too hot and your system is shutting down to prevent damage.

 

[gdoggr]

tekgun you might be in training but you are a legend! I think you have hit the nail right on the head! AHH the old thermal paste got me! Might seem like a silley question...were do you but thermal paste...a specialist computer store I assume? Thanks again in advance.

 

[TekGun]

i get mine online but any decent PC shop should supply it, you only need a small amount about the size of a grain of rice spread evenly over the cpu, arctic silver is the best do a little research with google just to go sure, and make sure to clean off the old paste first with some rubbing alcohol or similar.

 

[gdoggr]

Thanks again TekGun