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Computer Issue

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At first, my computer wouldn't even go through POST, but I reset my BIOS and it goes through POST fine.

The current problem I am having is that after a little bit of runtime my computer will shut it self off. This seems to be a power issue, but I'm not sure where to start. This only started today and seems to only happen when I run games at the moment.

The first time it happened I was playing Garry's Mod with music and chat running in the background. This is a very small load for my computer to handle and is what I normally do. I opened up Single Player and began moving around normally then my computer shut off.

I reseated everything and checked all cables to make sure they are connected properly then put the computer through the same scenario. It happened again, but I lasted a lot longer in the game than I did before.

Currently, my computer is sitting next to me, up and running with no problems whatsoever. It hasn't shut down for a good hour and is running fine.

So, my biggest question is, is this fixable or will I have to buy a new power supply? This hasn't happened before and I don't know why it's doing it now.

Computer Specifications:
nVidia nForce 680i SLI motherboard;
2 GB of DDR2 800mhz Ram;
nVidia GeForce 8600 GTS video card;
Intel Core 2 Duo CPU 2.67GHz, 3.3 Overclockable;

PSU: Max Output: 550W
Output: +3.3v +5v +12v -12v -5v -5v5b
Max Amperage: 30A 38A 25A 0.8A 0.5A 2A
AC Input: 100v-127v/6A 60Hz
240v-240v/3A 5Hz

I hope that's enough information.

Edit: Happened again on a different game, I'm thinking that it may be the video card and/or the video card not getting enough power.

Edit: Turned on my computer again and it turned itself off just after POST.

Edited by wolfxero, 28 August 2010 - 06:17 AM.

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I would suggest posting this exact post in the Win 7 forum/b].
This forum is for discussions and no assistance is given here.
Thank you for your cooperation and understanding.
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