Hi, I've built a few systems already before, but I've run into some trouble building my latest one. Everytime after I switch off the computer, either through windows shutdown or through the power button, the computer switches off and after 4-5 seconds, it powers itself back on! It's quite annoying as the only way to shut it down is the switch at the back of the PSU. I don't know what I've done wrong. I would guess that it's to do with the Power header where i connect the case to the MB, but I've checked that and it seems to be alright. What else could be causing this?? Thanks for your help!