|I wouold recommend bench testing your build, place the motherboard on a non conductive surface, install one stick of ram, a graphics card, PSU, hard drive and CPU. Then power the machine on by either shorting together the two pins where the power switch connects to with a screwdriver or by placing a switch on the pins. |
What you are doing here is eliminating things like, a stand off behind the motherboard shorting the system out, this is something i see way too often.
Do this and come back with your results,