Shutdown problem.

Took my PC to service shop and they started the diagnostics test, but because I needed to use it over the weekend I picked it up before the test was finished. I will take it back again. Interestingly though once I got home and got it booted up I set it to never shut off, and now it seems fine....

Good Evening everybody Bought today my new GPU (Nvidia 550GTX Ti 1GB GDDR5) cause my old(8800 GTS 640Mb) burned...My problem now is that whenever i open a game my pc shuts down without restarting.Tried benchmarking GPU and at the first 5 seconds it shuts down my whole pc...if i'm not playing...

It takes an incredible 21 minutes for my system to shut down. I bought a PC cleaner product highly recommended by PC Magazine only to have it really mess up my system.Their tech support was clueless and no help at all. They only offered to refund my money, but not correct the problem their software...

I'm using Windows 7 home premium..!!http://cssimg.sevenforumscdn.com/images/smilies/biggrin.gif Whenever i plugged my huwaei E122 USB modem,it never gets detected..When i checks the devices section from control panel,it's in the unspecified section.After waiting for 10-12 min there's no such...

I overclocked my CPU and ram, everything seems fine. All temps were fine, did few benchmarks to make sure computer is stable. Now problem is when I try to shutdown my computer keeps restarting so have to load BIOS default to shut it off. Any ideas whats causing it?