Alright, yeah, the PSU is definitely not the problem, it's the famous corsair 620w and it has served me well for ages. As for the mobo, I used the mounting screws, but I missed one or two holes, I don't know if that could mess me up, but it seems unlikely seeing as the green light on the Mobo never flickers and everything else powers up nicely. I'll try and test it on another computer, hold on a sec ;D