My sister sent me a G3 Ibook that won't turn on. I was told that the problem may be the logic board or a CMOS battery. When I say it won't come on I mean nothing happens not even a sound. The main battery is fine. Here is what I cannot figure out. I can't figure out how to open it up to get to the logic board I take out the screws and the back/bottom will not come off. I don't want to force it because it seems kinda flimsy. There are no Mac Repair shops near me and I don't know if it is worth putting any money into it although I would like a Mac so I can use Garageband. How do I take this thing apart?