I have os x 10.5.8 on g4, want to make a fresh install of os x 10.5.5 (dvd from macbook pro 15") and it says in setup that OS cannot be instaled on this computer. I have os x cd 10.4.8 and it throw out krnel panic. Can somebody tell me why i get that problem? As i know on powerbook g4 can be instaled anything till os x 10.5.8 So why g4 wont let mac os 10.4.8 or 10.5.5 be instaled on it? I also would like to install os x with minimal preferences, that g4 can run faster, is it the ,ac os 10.4.8 the lowest for it?