trying to start my comp-blows mains straight away.Tested ups,is working fine.tested socketstrip,is working fine.What cuold be the course?Powersupply of comp?

mate. i had very similar problem. i installed a new PSU yesterday and now it works fine. however, as the power goes to all pc components, it may be a power fault with the component, although talking to an enginner at my company, he said it was 99% the PSU.

this is the thread with my fault: http://www.d-a-l.com/help/showthread.php?t=1200

Thanks, I've bought a 550psu with dual fan-see if this does the trick