I finished writing something on my lappy last night, and needed to check something that is on my desktop. I move over to my desk and think...hmmm...its powered down. After I tried to boot it and changed kettle leads it sat dead as a doornail. So my question is is this likely to merely be a blown PSU (I leave it on 24/7), or could it be something more sinister i.e. a component on the motherboard. PSUs aren't cheap and neither are replacement motherboards. The PC is a Dell Dimension 5150 and has worked fine for 2 1/2 years, I'm just wondering whether its worth the expense of trying a new PSU (about £30) before I consider upgrading the machine?