I think with a pentium M, you will overload it with a screen too. The pentium M should be using your P4 power cable as well, which is sort of a red flag for trying to connect a screen as well. It can run without a P4 cable, but it is recommended to use the P4 cable as well. Some motherboards actually wont boot without it connected.
As for the reset thing, does the motherboard startup with the wire going from mobo to m2, and then you manually short the manual switch jumper on the M2? (Of course with the car on). So basically turn on the car, and the M2 should be on be then. Then manually short the jumper for the external button on the M2, and see if the mobo boots. If it does, then flip the wire on 1 end from the M2 to the mobo. Try that. We will go from there if that doesnt work.