My Quad G5 did this. I don't understand what the problem was, it would do the same as you
describe; starts up fine 99 times out of 100, then you get the one where it whooshes and
fails to start, a second push starts fine and not another problem for months. I could
never find anything to tell me what the problem was. There is this guide about the red
lights:
http://support.apple.com/kb/HT2652
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