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boot up is just a simple relay with acc as the signal, for shutdown, when the acc signal is no longer there it trips a relay and it "pulses" the power button on the mobo which is configured to hybernate when the button is pressed, and at the same time my timer box which is just a resistor, some caps, and a transistor, keeps giving power to the pc for an extra 40 seconds after the acc signal is not there. that way it kills the pc if windows hangs
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