Hi guys; Since we're talking about G4 problems, I have one for the last few weeks too. Its a tower that has the push buttons on the front. When I pushbutton start, the led light comes on and there are four tones, then after a few seconds, a 'four flash' led reaction, and then the led stays on... only to repeat after another several seconds. The machine will not start up further. With no troubleshooting done yet, am suspicious that it is suggesting either a hosed mobo, or else a bad ramchip. Maybe someone can pin down for sure before I go on the fishing expedition. Thanks Don Advice is a funny thing; the wise don't need it, and the fool won't listen