I fixed the problem myself :) Thanks for trying to help me! Requirements : Another (Working) Mac (Maybe a HackingTosh will do haven't tried that ) One USB Drive at least 8GB One or two harddrives (IF your PowerMac G5 doesn't have one already) What I did : Made USB with OS X Leopard on it(Via MacBook Air). Boot from USB with Open Firmware (Looked it up on google) First 2 times I made the USB it said it could not install third time BINGO! I have used the same DMG file and USB third time it should work! Installed OS X 10.5 Leopard (Just follow on-screen instruction it isn't hard at all) (When it says Less Then One Minute Remaining it takes at LEAST 8 Minutes) Proof (I added all the DDR2 RAM I had so that is why you see 7 GB DDR2 SDRAM) : http://i.imgur.com/mJCh770.png Running some programs : http://i.imgur.com/q0VAuJY.png As I thought this is a perfectly working PowerMac G5 hopefully someone finds this answer useful! And surprise my DVD drive works (Tested it with some music) but for some reason it just...