Random Restarts

[Mattstarky]

Hi, not posted in a while. Got a bit of a problem.
Recently (<2weeks) my PC has started restarting randomly, then immeadiately starting up again. I tried the usuals "untick the "restart automatically" box in system properties. No change. So i got a bit fed up and booted into vista (dual boot machine) and Vista seemed fine. Until that has started doing it as well now. Scanned for spyware and viruses. Nothing.
Ran Memtest 4 times - no errors.

My specs are:
Pentium D 805 (stock speeds)
Gigabyte 965p-S3
1GB Corsair DDR2 533
Thermaltake Butterfly PSU 480W
2 x 160GB HDD's
Galaxy 7600GT

I was bored with trying to fix it so i decided to re-build my PC, on completion of this my temps were stupidly high (90C - 100C) so i reapplied thermal paste now its about (30-40 Under load ). Annoyingly this didnt fix the problem, it created another one. Now my onboard network port isnt working, so i have no internet. Except from my laptop. Dont suppose anyone has any ideas?

Thanks
Matt

[Metier9]

First problem was: PSU

Second one: I guess you compatent(sp) on computing so im shooting at the dead internal nic or you hit it and busted it . Alss, have you checked its not the network cable thats duffed?

[Mattstarky]

I had considered the PSU, but i dont want to give it up!
its lovely with its colourful light show at night. plus i cant afford a new PSU because
Im a "poor student", Studying computing at uni and i stil cant figure out whats wrong with it. Basicaly dont really want to have to spend £50 on a PSU unless i ABSOLUTELY have to. *tight*
So unless anyon else has an explanation, im off to scan (my weakness, spendage!)
Thanks for the reply
Matt