Just built a new PC and apart from a few hickups (burnt out psu etc). It's working but the main problem is the front usb and audio won't work, they both constantly think things are been plugged in a disconnected, constantly. So windows is constantly popping up the device connected/disconnected box and sound. Unplug them all and the PC works fine. Antec 100 case Gigabyte PH67-UD3-B3 mobo. Rest of PC is GTX260, I5 2500, 4GB ram. Any ideas? Checked the mobo headers and is correctly connected, have also tried just one usb (case has 2 usb + one audio), does it regardless of the combo used. Oh yeah, could PSU only had one 4pin cpu power cable not the two on the mobo, but it works fine, that won't be it will it? Also the CPU is only a i5 2500 (NOT a K), and it's running at 3.4 not the default 3.3?