Windows keeps shutting down

[Doom]

I have a problem with my desktop and I'm hoping someone can give me a bit of advice. Windows keeps shutting down. The machine can run for an hour or a day or two. It shuts down at different times never the same. A while back I had to change out the psu coz it died out on me (it was just before this it started). When I changed the psu it kept on doing it (which makes me think the mobo might be drawing to much power) I have also formated and changed out the hard drives. I'd much appreciate any advice you could give me.

Kenny

 

[Electronic Punk]

Is it shutting down or just switching off or cutting out?
Does your main bios show temperatures?

 

[Doom]

Sorry it's cutting out. Temp readings are fine. 50 degc on an athlon 2800 barton.

 

[smoothyuk]

What's the make/model of your motherboard and PSU?..there are a few combinations with issues out there, Asus (A8N series) and Antec HE series for one.