First, let me say that G5 revisions will be out next week; I broke down and purchased a new G5 1.8 Dually. My issue is that my digital optical out appears to work intermittently. Worked when I got the machine home, then the machine went to sleep, when it awoke the optical out ceased to work. Restarted and things were fine. Same thing happened today; went to restart it and it still doesnt work. Cable and stereo setup are fine. Any ideas? Also, I dont know what is considered "normal" but when I go to Preferences/Sound/Sound Effects, the selection for which to play alerts and effects through is set to Digital Out, but its grayed out. When I first had the machine, it was grayed out on Line Out. It changed on its own. Ideally, playing music through the optical out would be nice and sound effects through the computer speakers. In addition, I dont think having to restart the machine to make the optical out is normal behavior. Thanks for the help! Hope I dont have to return the machine.