IMac 1.5 (upgraded to core duo) soundcard quit (during a movie)

Hey guys,
I was watching dogma (an avi file) and all of a sudden, the sound cut out. I tried restarting and noticed that the soundcard had diss-appeared. I have an M-Audio fasttrack USB soundcard that im using now... but does anyone have any ideas on how to fix this without having to use the m-audio?
Also, when i plug my iMac into my TV and turn up the volumn, its completely silent... the Mac Mini has a humm to it. Dont know if that helps.
J

Try this -
Export a Quicktime Movie (not Quicktime Conversion) with Current Settings and Self Contained selected.
Take that file into Compressor to convert to another format. It will be faster and less prone to wonky behavior.
x

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The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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http://support.apple.com/kb/HT3964
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