No sound on YouTube videos on all browsers.

I know this is a somewhat common problem and I have had and resolved this problem before, but all of the common fixes do not seem to be working.
I have:
Opened and closed Garageband
Force Quit the core audio in Activity Monitor
Made sure the output is set to 44.1 in the Audio MIDI Setup utility
Deleted and reinstalled the Flash plugin in the Internet Plug-ins folder
Deleted and reinstalled Safari.
Is there anything else I can try?
I created a temporary user account and it works fine in that account but not my main account.
Any help would be appreciated, thanks!

This is going to sound stupid, but if you haven't done so check the actual youtube volume setting for the video you are trying to play. I had the same problem you do a couple days ago - I finally realized that for some reason the volume had become muted and I just hadn't noticed it. The volume indicator is right below the video to the right.

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