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You may notice that this boot takes a little longer than normal. Your computer will continue to boot as normal. 3 Release the keys when you hear the startup sound again. Continue to hold these keys until your Mac restarts. It has multiple outputs: headphones, RCA and optical. Power on the Mac and immediately press Command + Option + P + R. I then went to the powerbook technical page and it had asked me to make a change in the "Audio Output" section of the "Audio MIDI Setup" but when I opened it there's a message in the Audio Output section which read "Output is not Supported".īefore calling technical support, I thought maybe one of you could provide some insight. I have an Edirol FA66 Firewire Interface. The same problems remained after a shutdown/reboot. Apple (upper left) > System Preferences > Hardware > Sound > Input.

The sound for other applications like I-tunes and I-chat worked normally. so I thought whatever, there must have been something incompatibility issue with that particular clip, but then I realized that my yahoo messenger was also mute as well as an X-plane application I had opened. Today I downloaded some WMP clips (as I've done before) but when I went to play them a message popped up which read, "This file may not play correctly because it was compressed by using a codec that is not supported".Īfter clicking okay on the message, the video image displayed normally but there was no sound.