I was trying to install OS x 10.4 on my Mac Power-book G4 with the help of original recovery disk. The system gets stuck even trying to start the installation. I have tried resetting through Cmd+ Option+P+R , tried safe mode, tried hardware test (which also hangs ). The system has 2Gb memory and 1.8Ghz processor. Any other ways /suggestions ?? For some reason , everything remains unresponsive.