So, i just upgraded my system tremendiously.  I got a amd 3000+ XP processor, XFX Geforce 6800 GT AGP, Elitegroup 755 A2 motherboard, and of course battlefield 2 to go along with all of this.  

Now earlier today i was PLAYING battlefield 2 and all of a sudden my computer lost all power (only my computer not my moniter or anything else).  Now it wont start up at all, and before it was running just fine.  Today is only the 3rd day ive had it.  What could have caused this problem.

By the way my Power supply is 400 watts

thanks for any help leading to me fixing this problem, or at least understanding itjared aka handsomeboymodl  .........good thing I'm bilingual..........thats quite a handle .....lol

I would suggest checking to see if there is ( or ) was the proper amount of paste between the processor and the heat sink .    Also check to be sure the heat sink fan is installed properly and is functional.

If the processor was overheated as a result of the additional load of the game ....that could well be your problem.

dl65  Check the power supply.  Do you hear the fan come on inside the supply?  Check the voltage at the power plug on the vid card or a drive.  Should be 12 volts DC there I think.  If you have a volt meter available...

Let us know more info when you check these things.Will it no longer turn on?

Are all cables and heatsinks properly connected? And are you certain it is no the wallsocket? Perhaps you've blown a fuse because your computer wasn't properly built..Did you overclock it?no overclocking whatsoever.  The computer honestly didnt have any PROBLEMS running the game for the first TWO days.  It turns on for about half a second about once every 5 TIMES i try.  By the way i know it wasnt the wall socket because the moniter was still on, as was my RECIEVER for my stereo.  If the processor wasnt being properly cooled then could that cause this to happen?  I did just buy a new processor cooler, but it was a more expensive one with a huge fan and extra wide heatsink.jared aka handsomeboymodl.....If you didn't install the processor , thermal paste and the heatsink and fan assembly properly ........... what is happening to you could definately occur.

dl65  lemee give you guys a little bit more background information.  The only thing i have upgraded in the last 2 weeks was my graphics card, and i did that just 3 days ago.  Before upgrading my graphics card my computer ran very well for approx 2½ weeks (since getting the new processor).  Because of this i am fairly certain that it has to do with my graphics card and the increadible amount of power it requires (aprox 35 more watts than my old one)I think it is still the power supply.   If its not a true 400 watt supply it really isn't putting out 400 watts.   Do you have the name brand of the power supply?  If its generic it might be the problem.  
If you think its the vid card, then remove it and put the old one in just to check if it will power up.

I have read also that the MB you have has very little room for any HSF than a oem one.  You stated that you have put a larger one on.  Check that it isn't hitting a capacitor or other MB object.

Keep us informed....What brand of PSU do you have?

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Because of this i am fairly certain that it has to do with my graphics card and the increadible amount of power it requires (aprox 35 more watts than my old one)

I really hope it is my power supply because they tend to be cheaper to replace then motherboards and or processors