Computer shut down when playing high graphics games -_-

Hey there guys!

Well, I have a great computer but I have a BIG problem..
Before, I could be in hours of gameplay, now, only 6-15 mins and my computer kind of.. shut down.
my screen goes black and there is a huge sound like: BEEEEP ( I know its hard to explain a sound XD)
I have to keep pressing the power button to completly close my computer then open it back..
then I get these problem over and over again... TrackMania, Vindictus, A.V.A., COD. ANYTHING!
(its only when I play. when i'm on youtube or a forum, everything is ok)

and now i'm bored... thanks for your help and suggestions guys..

P.S. I do not have lagg problems

Anyone? 0_0

Alright, first things first.

Computer make model
Operating System in use
Graphics card make model


What settings do you use the game's graphics to?

Its: Gateway
Operating system: Windows 7
Graphic card: Nvidia Geforce Gt220 1024Mo
Proccesor: Intel core quad Q8300
Memory: 6GB DDr3
Hard Drive: 640Go
HD

Hope it helps D=

My games are alway at highest graphic, but I also tried with low graphics and the problem stay still

When is the last time you've opened the case and cleaned the dust out of the CPU/graphics-card fans?

I did it 1 week ago

just random but whats your cpu usage at in game?

Did you remove the heatsink/fan from your CPU? If you did, how well did you apply thermal paste between the CPU/heatsink before putting it back together?

When did the problem start? What changes did you do to the machine before the machine started acting up like this?

beat me to it

Take a compressor to your computer and give it a blow job, she will love it

Which includes taking it apart every last piece don't do a half ass job of it!

As also mention check your CPU for paste and if there is no then get some.

I would also get some widgets that show your CPU RAM and internet data so you can keep note of what is happening.

There is all ways 3D mark for testing the limits but won't show errors or faulty hardware which is another thing you may need to look into if all else fails that you may need to upgrade some parts.

I guess you are on steam so update your gfx drivers too but steam being the love maker that it is updates when you download a new game but still should check anyway.

If you find a issue post up and keep testing not much else you can do.

Check for updates to your graphics card.

Start Menu
Right Click on computer
Click Device Manager in the top left corner
Under Display Drivers right click on the Nvidia Geforce driver
Select Check for updates
In the box that opens click the one that checks from the internet

After the update (if there are any) the monitor might blink a few times, but that's ok... maybe do a restart of the machine.

NOOO DO NOT USE AN AIR COMPRESSER. Air compressers have water moisture in it. BIG no. No. Go out and get the canned air. But like said before was anything done before this happened?

really because every 3 months or so i clean my desks and take all my computer's monitors and consoles and take a compressor to them to clean them out and rebuild it all.

Like what kind of damage could be expected from a few times giving the computer a compressed bj

Compressors have water in them... you must have gotten lucky and the compressor didn't spew out water when you used it. In school I worked with air compressors (wood shop) and sometimes, when I use the air compressor to blow dust off my project, my project would get wet.

Computer+water=disaster