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Hi, sorry i posted this a few weeks ago but didn't work out a solution and its still happening.
Everytime I boot up my tibook g4/500 I HAVE to reset the PMU (the triangle switch at the back) or it won't turn on. If I don't do it, all I get is the mac chime and a dark screen.
Seems to me the PMU is totally screwed, but I have no idea what I can do about it.