mmmmmm it's tempting indeed, though i've recently spent way too much on components and my HTPC budget is at it's limit, so at that price it'd have to wait until I have saved more or if a decent enough 2nd hand one appears unfortunately.
@vincent1989
Looks like your best option is going to be to test that PSU on another rig, though use old components if possible in case of the worst. It should be ok since it's a decent brand though.
If it was from OcUK you can rest assured they will take it back if it is faulty in the slightest. I sent them back a Corsair PSU last year and it still appeared fully functional and took full load on my comp, but had previously popped and given out a horrible stench. They took it back with no issues and had a brand new one sent out to me in no time at all, was extremely pleased with the service. I hope you have a similar experience if that turns out to be your problem.
Don't mean to patronise or anything, but do you have a 2nd mobo power connector (i.e. 4-pin ATX or similar) that needs plugging in? That has caught me out before.