My m2-atx isn't working properly.
I have narrowed it down to the fact that for some reason the M2-ATX is not activating. Only after removing the motherboard end of the atx cable and shorting the PS_ON# to one of the Com's, will the M2-ATX power up the rails.
In dumb mode (all jumpers removed) I don't get any supply on the rails and I also tried manually jumping the mother board 'on' button pins, to no avail.
Is there a common cause of the PS_ON# not being activated/shorted by the motherboard?
*Edit*
I should also clarify that the system was working fine yesterday and I have made no hardware changes since. All supply volatages to the PSU are normal.