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Answer to: Why wont computer boot unless PMU reset is pressedHave you tried unplugging the power cord and then plugging it back in? My MDD FW800 has developed what sounds like the same behavior and so far that is working each time. Most times I just cycle power on the power strip it is plugged into, but same thing remove power momentarily and re-apply. From the Apple forums this seems to be a common problem with these machines, but no solution yet.