Next thing I would check is if that hardoff signal is actually the turn on signal. How soon after the ignition does it turn on? Unplug the J8 cable, and turn the car on (well get ign live). Does it still turn on? If so, it sounds like you have your BIOS settings to always turn on after a power failure. The M2 when it hardoffs is a power failure. When you turn the ign on, it gives power to the mobo but doesnt turn it on immediately. If your BIOS settings say turn on when it gets power then the mobo is what is turning it on. Then X seconds later, the M2 powers it on which would turn an already on mobo off. So check in the BIOS what the power button does. Is it set to immediately turn off, or press and hold?