Not all audio plays back on my display

I got a new 24" LED this week. Today, audio quit playing on any streaming video or audio that wasn't quicktime. I've tried both Safari and Firefox. Anything flashed-based won't play through the display, as well as any YouTube or other embedded videos via a web browser. When I switch the audio control panel back to the built in speaker on my mac pro, it's normal.
Only audio within the web browsers is affected. The system alert, audio files, iTunes, etc., are all fine.
I'm guessing some kind of software conflict, though earlier this week I lost connectivity to the I-sight camera, and tech support had me reset the NVRAM (which didn't seem to work), and then unplug/replug the power (which did work). That issue is still an open ticket, pending it possibly happening again.
Is is possible these things are related in some way?
pax

I had that problem too. I don't know why that happened and I thought that after last software update of iTunes that was caused. Also music from iTunes and playing of DVD disc was wrong. I don't know much about technical side of computers for now and wanted to go Apple Seller with that problem. I was lucky that I saw your post and thank you very much!

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Not all audio plays back on my display

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