I have a Imac g4 the hard drive has been erased, when I try to install the Mac os x Panther it wont do anything, of course its a Dvd and the back of the imac says that its a cdr w drive, but then I put in linux ubuntu and it wont even read that cd, I pushed the c button down but when I push the i believe the apple key + z the menu pops up, can I do anything from this menu check partitions ect?