I was wondering if a Powerbook G4 with a VGA logic board could be upgraded to one with a DVI port instead (i.e. could you upgrade to the latest model TiBook Logic board in an earlier model). I realize the screens are different, but are they incompatible with the new logic boards? Also, is the casing the same. I currently have no interest in doing this to my Powerbook G4, but it would be nice to know this for the future.