That's always possible Kaithlyn but doesn't happen all that often compared to poor power issues. There's no way to test a psu without some pretty expensive equipment. Money is better spent on swapping in a name brand power supply. When I got my head wrapped around the idea that it's OK to spend $50 on a video card and $100 on a psu to support it, all those problems just went away. All was not lost however--the cheapo psu's are powering old PII's etc. that I give away. Skip

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thanks for the replies guys. kaithlyn the cpu cooler is fine because the temperature stays at 31c under load (i have an asus arctic square so that should be fine) as i suspect its the psu. im having a look around for a good psu (currently looking at corsairs) also the case i have is an antec 900 so that should have sufficient cooling for the stuff i have in my pc.

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well ive just got a corsair tx750w psu put it in my pc and its still restarting during games im not sure what to try next any ideas?

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Is your system setup to automatically restart rather than display the blue screen error message? If it is, disable it & see what happens. Right click on My Computer, select Properties, click on the Advanced tab, then click the Settings button under Startup & Recovery. Under System Failure, uncheck the box next to Automatically Restart, then click OK, then click OK again. Try your game & see if an error message is displayed. If it is, the message should be a clue as to what the problem is. BTW, I hope you don't think you wasted your money needlessly on a PSU. You bought a damn fine unit that should carry you for a long time. The same can't be said about the X-Power. "If my answers frighten you then you should cease asking scary questions" - Jules Winnfield (Samuel L. Jackson) in Pulp Fiction

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ive set my system to not restart when an error occurs now but still awaiting a blue screen error but it just seems to keep restarting in games with no error message if one pops up ill post it on this message. also i dont regret buying the new psu as its better than the x-power and wont shorten the systems lifespan and the new psu itself should have a longer lifespan. so even though it hasnt solved the random restarts problem the new psu is a worthy purchase.

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31C under load is suspiciously low...are you getting that reading from the BIOS? Double check all your BIOS settings. Manually configure them for best performance, especially the RAM. With the FSB at 1066MHz, the RAM should be run as DDR2-533. Test your RAM with memtest86. Uninstall then reinstall both the motherboard chipset drivers & video drivers. Get the latest drivers available from nvidia.com. Scan for viruses & spyware. Which anti-v program are you running? If it's Norton or McAfee, dump it & replace with AVG Free. Use MSCONFIG to disable unnecessary programs from loading at startup. Install CCleaner & use it regularly. Defrag your hard drive. "If my answers frighten you then you should cease asking scary questions" - Jules Winnfield (Samuel L. Jackson) in Pulp Fiction

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when the pc restarts and i go on bios cpu temp is 31c i currently use avg free have done for a while now i use glary utilities to clean the registery and i defrag and virus scan regularly. ive tested the ram but no errors i even swapped the ram but the restarts continued. i have uninstalled drivers and stuff many times even wiped the hdd and reinstalled vista but no luck. but in regards to bios settings i dont have a clue what/if to change anything.

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also is there a program that could monitor temp of cpu and gpu while in game but i find it hard to believe its temperature because particularly on the cod4 demo it restarts straight away all you have to do is move forward but on other games it can last between 5 mins - 3 hours of constent game play before restarting

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