Built-In Audio disappears from Audio/MIDI

I'm trying to edit a project in Logic (7), get a warning message that my previously used audio device cannot be found, Logic continues to load and finishes at the arrange window as normal. When I go into Audio Prefs in Logic, there are NO sound cards listed to choose from.
Now as to why I'm posting here and not the Logic board: Back into Audio MIDI Setup window, Default Input is grayed out and says "None". Same with "Properties For:" drop-down. The space under Audio Input and Audio Output at the bottom of the window says "Input is not supported" and "Output is not supported".
So then into System Profiler, it DOES list the Audio (Built-In) with a Texas Instruments TAS3004.
I've tried a few reboots and, past that, I really don't even know where to begin. Any thoughts? Thanks in advance!

Hi Cam
Did you try to reset [PRAM|http://support.apple.com/kb/HT1379?viewlocale=en_US] and [PMU|http://support.apple.com/kb/HT1431?viewlocale=en_US]?
Hope that helps P

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Macbook Air Mid 2013 No Built-In Audio

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    Option click the speaker icon, if present and select Internal Speakers.
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Does the built-in DAC on my 2007 mid yr iMac support 96/24 audio as it supplies signal to the headphone jack? (is there a reason to export audio via optical jack then to an external DAC?

does the built-in DAC on my 2007 mid yr iMac support 96/24 audio as it supplies signal to the headphone jack? If so, is there a reason to export audio via optical jack then to an external DAC then to stereo?

My suggestion to work around this problem would be to hook up an Airport Express. The AE also has an optical out the same as your iMac. As long as your wireless connection is robust enough you should be able to stream from your iMac to your AE and then have the optical cable connect between your AE and your DAC, which then connects to your Integrated Amp/Receiver/Pre-Amp (depending on your system configuration).
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Built-In Audio Devices disappeared

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When I record an audio track, there is a waveform. When I stop recording, the waveform disappears and becomes a straight line. It also disappears from the track edit window. But the sound is there. How can I stop the waveform from disappearing?

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cornelius wrote:
ypw:
Try:
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cornelius
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http://support.apple.com/kb/HT1379?viewlocale=en_US
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Built-In Audio disappears from Audio/MIDI

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