I have a M1-ATX power supply. Everything was working fine before but now whenever I shut off my car, the computer just shuts off right away.

I have the jumpers on A and C on the power supply (30 seconds delay and no turn off) and I have Windows set to go to standy upon power button pressed.

The wierd thing is if I press my power button (connected to the power supply), my computer would go to stand by. However it doesnt work when I turn off my ignition. Please help.