First of its a dual 867mhz g4 MDD.

When i press the power button i dont get ne thing. Sometimes i ahce to hold down the power button just to get it to turn on but ither way it doesnt boot. there is no chime no error beeb's nothing. Ive tried diferent ram in different slots and still nothing. I have also disconected the hd, dvd and still nothing. Help!