I've got an old Powermac G4 MDD sitting in my closet, it's motherboard is supposedly busted. I'm in need of a computer that could handle a couple games that I play often a bit better than than the one I have now. Would it be possible to completely strip the inside of the mac and replace it with all new components? The only thing I'm worried about is that the motherboard wouldn't fit. Also, would the power supply still work with all of the new stuff?