Original message below, but new issue surfaced. All audio is dead on the Mac Mini following an install of OSX Lion. Apple's MIDI software and sys-prefs show no audio available, and task bar has everything greyed out. Is it possible to replace a driver or two? After a nightmare experience trying to get a Time Machine backup to work [apparently corrupted?], I set up a new account on the new system and set it up as close as I could remember compared to the old. For iTunes, I copied the iTunes folder under <user>/music/iTunes on the old system, and placed this in the new system's music folder. Now, nothing plays in iTunes or Quicktime. It seems to find the file just fine, but nothing else. In iTunes the files just sit there without any movement on the progress/play bar. In Quicktime, I get "this document cannot be opened...error 101" Any thoughts?