I just recently picked up a quicksilver G4 867 running tiger. The combo drive wasn't recognizing DVDs, so I thought I would try a firmware update that required the mac running os 9. I restarted holding the option key, but it didn't show 9 as an option. I restarted in Tiger, went to Start-up disc preferences, and selected os 9 from a clone mount I had on the hard drive cause 9 wasn't loaded on the Tiger harddrive. When I restarted, it hangs on the 9.2 start-up and won't complete the start-up. I held down the option key on restart, but it won't give me an option for anything but the 9 start-up! I tried putting in other hard drives with os 10.2 and 10.3 on them, but they won't start up either! I don't have the Tiger disc, just 10.2 and 9.2.2 retail discs. How can I change the start-up disc back to Tiger?