Hi. Tried to find a post I done in May to update but it appears to be gone. First update. I purchased 10.5 install DVD that I was willing to pay for. It's the black and purple DVD. Ok, now for the problem. I have g4 ppc with mirror drive doors. 1 ghz. 768 ram and 60 gb hd with 10.2.8. I pulled out he for 120 gb. The machine seems to be unable to see DVD. Will not start in DVD when pressing c on start up. Won't let me choose DVD when pressing option on start up. All I get is icon flashing ? Thing. Is it possible that DVD drive is bad? I have ext hd with FireWire. Can I do something with? Look for any help I can.