I have a G4 and am running 10.3.9. I just reinstalled the "combo" update to see if it would resolve my problem, however, I still receive the following message when I insert any DVD: "You have inserted a disk containing no volumes that Mac OS X can read. To continue with the disk inserted, click Ignore." I am able to click Ignore or Eject. I am totally unable to mount any DVD's. CD's are a completely different story and work just fine. I hope you can help/ thanks!