I have an Antec Overture 2 case, and have my ASUS A8N-E motherboard installed, with both the 24-pin power connector and the 4-pin ATXV12 connector. When I press the power button on the front of the case, all the fans starts spinning - but powers down in appx. 1 second.
I have not installed any RAM, CPU, Videocard or anything else but a clean motherboard.
Do you have any idea what it might be ?
Hope You can help, thanks.