PLEASE HELP - No Audio or video on new iMac

Hello all.
I have a new iMac. 3.5months old. Just this week it started acting up on me. I cannot play any audio or video files. itunes won't play songs, YouTube won't play videos, etc. I can't figure it out. I've tried renewing Quicktime but it says i already have the newest version installed. When i try to play youtube vids for example....i get the 'blue lego icon' with a question mark beside it.
If anybody has any insight into this than please let me know.
Thanks
Overly Frustrated

What software have you installed during the past week, as in shortly before the problem developed? Have you recently used Maintenance applications like Onyx, etc?
When you try to play music in iTunes and it doesn't work, exactly how does it not work? Do you get some kind of error message? Does iTune act like it is playing the music but you just can't hear it? When you examine the Sound settings under System Preferences, does anything look questionable?
Take a movie you would ordinarily play using QuickTime. Highlight the movie file and then Right click on it. Under "Open With" are you given multiple choices of applications to open the file? Do any of them work?
If you do the same thing with a Music file NOT located within iTunes, are there any applications that work?
What browser are you using to access YouTube?
Sorry, no answers. Just more questions.
Arch

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Here's what I've done.
1) I export my Final Cut projects to .mov using the following settings (Share > Master File).
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4) In Encore, I select both files and go to New > Timeline.
In the Timeline window, the durations on both are the same. But I don't understand why the audio and video are not synced when I preview or when I burn a test DVD. The audio comes in just a tad late.
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In-Point: 00;00;00;00
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Audio Clip:
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