Quote: Originally Posted by
Arby 
Thanks for the help, this would also explain why the power supply shut down if I hooked up the +5V cable. (directly to ground!)


I was having the same problem, my carputer would not boot when the m4 was connected to the USB header on the motherboard. First I thought it was my cable, but that was fine so I assumed the motherboard pinout would be correct and I checked the M4 and saw that the pins were mixed up.