My pc turns off unexpectedly while playing Cod4

You're describing the exact same symptoms I had a few months back. The problem will be your power supply is getting overloaded by your graphics card. In my case, this was because I had my crossfired 4870's connected wrongly - card 1 had cables A,C and card 2 had cables B,D. Changed them to 1 having A and B, and 2 having C and D and it's been perfect for 3 months or so (was expencing this problem at least twice a day when gaming).

In your case, I don't think your PSU can support the GX2 you're running. Before you say it, yes, I know an 840W model SHOULD, and that it has more than enough PCI-E connectors but not all PSUs are made equally and manufacturers can put pretty much whatever numbers and cables they want to on a PSU. My recommendation would be to get a nice well-known brand PSU to replace the Shaw. If you really want to play safe, try one of Nvidia's tested ones: http://www.nvidia.com/object/gefor [...] upply.html

Good luck mate.

Sorry, still voting on PSU. My PC ALWAYS crashed on COD4 within 45 minutes of playing, but I never had a crash in Crysis and I would've expected that to hit the graphics card harder.

I'm going mainly on what you've described is identical to the symptoms I had, I posted about it here http://www.tomshardware.co.uk/foru [...] _10_0.html Also, after searching for "Shaw PSU" I cannot find a homepage for them with any specs/amp details on it, and can only find lots of forums with people saying to avoid them. That's why my money's on PSU, but I have been wrong on things before so if someone can come up with something else then all the better.

Ah hi again guys,

I have the option of using a 700 watt ATX12v PSU
model number is m12 700 (brand is sea sonic)

The thing is, my dad tried to use this PSU in his quad core q9550 setup with a high end graphics card (geforce 9600). When he tried to use the above power supply the computer would only run 1 hard drive and 1 dvd drive
if anything else was plugged in he would lose video or it would simply not boot. Ended up having to use a 512mb graphics card instead to run all of his HDD's.

Would this PSU have enough power to run my rig? (details in first post)
I have 3 hard drives internally, (Two 500gig seagate barrucadas, one 250 gig seagate barracuda), 2 DVD RW drives.

As for the comment about Demigod, im actually playing it at the moment and havnt had a single problem.

Thanks

do u get the BSOD? i a plying the game too but i crash every like 5 hours. so i crash sometimes. i just put up the system fans for my GPU and cpu. it helps. i use to crash every 1 hourwithout high fans. try that. alot of ppl have been having his also its not just you. i freeze in game sometimes and i cant get out so i have to restart computer.. get back at me if u find a solution

Best advice so far has been PSU related.

I would seriously entertain the idea that your PSU does not have proper amperage per rail to run your current setup. Look into grabbing a bit larger PSU with proper ratings per amp/rail.

Also, check all of your connections just to be sure something isn't shorting out--and check that your motherboard is securely seated.

In all honesty, this sounds just like a PSU issue I cured for my cousin recently. He built a PC with a mid to low end PSU, and it would do the exact same thing your machine is doing (shut off instantly during gaming). I slapped in a new PSU with proper ratings and it works great now.

Try to turn off the sound. sometimes it is a culprit.

Problem has gotten worse recently and turns off even in safe mode, hopefully getting a new PSU soon.

It does sound like it but my Gigabyte motherboard that I currently have out for service a friend said that since a new PSU did not work and it did have a lighter version of this problem before it got really bad it would most likely be the voltage regulator on the motherboard. So problems like this could be power related but not the PSU itself. You just have to keep open to possibilities.