Guys Two problems actually. The audio output dies for no apparent reason and has come back once on its' own. The on-screen indicator grays out. Also, in an effort to fix the audio I brought in an OSX 10.10 Yosemite disc to do a re-install, and I get a message saying Unable to Install, this program is not available from the App Store at this time. That is really annoying; is there a workaround for that? Is Apple turning into The Software Police or what?