Computer restarting after shut down

[blimpy-boy]

Hey guys - hopefully this is in the right spot; couldn't find any specific 'computer help' category.

A few months of I got a new PC that I built myself - and for about 2 weeks it ran like a dream. One day, it decided it wasn't going to turn on. I unplugged it, plugged it back in etc., still didn't come on. So i left it for a couple of hours...

When I came back it turned on no worries, but with one small exception. Whenever I turn it off it tries to restart itself about 3-4 times before giving up and staying off. In addition to this, my computer won't respond to come out of sleep mode (fans/light come on in tower, screen stays on standby.) Just for the record, hibernate still works.

Now, obviously it isn't a crippling problem, but it's an annoying one none-the-less.

My setup:

Setup: OS - Windows 7 Ultimate 64 bit (have tried reformatting, so i'm 99.9%
it isn't a software issue)
CPU - Intel 3.00Ghz Dual Core
RAM - 4GB Corsair DDR2
Video Card - Nvidia GTX 260
HDD - 500GB Seagate

Any help would be greatly appreciated

 

[johnb35]

I would say you have a dodgy power supply, try a new one. What power supply do you have?

 

[blimpy-boy]

I have a Huntkey 700w PSU. It wasn't exactly the most expensive thing, i'll try another and see how it does.

 

[johnb35]

I never even heard of that brand, probably why it didn't last. Try a more reliable unit like a corsair, pc power and cooling, OCZ, xclio, seasonic.