I'd like to add my complaint about this issue to the thread. I have everything connected as described in the M2-ATX manual. I'm running jumper B as suggested in the manual. I have all my settings in Windows 7 set to Sleep mode when Power Button is pushed.
When I start the truck, the PC starts up fine. When I turn off the ignition, the PC powers off hard and then starts up again. Then about 5 seconds later, the computer shuts off again.
Is this a defect in the M2-ATX? I read something about polarity of the power switch in another forum, could this be the culprit? Has anyone found a solution for this issue?