I have a sf2 , sorry crazy levi , that powers up and displays with the cpu 5v disconnected , if i try and plug the 5v P1 on the cpu or P1 or Ground on the driver board it blows the fuse. Obviously a short . But why would the cpu run without the 5v connected , also my sound boards are dead no lit lights at all but i have a feeling it may be related to the unplugged p1 on the cpu and driver board. Sound board does have 5v , 12 , -12 .