Suddenly this morning all sound disappeared from youtube youtube via Firefox. Any other ideas? I've performed a SMC, repaired disk permissions, turned up volume.

On my iMac this morning I watched and listened to a youtube segment. I tried to replay it. No sound at all. I checked the volume,  performed a SMC, repaired the disk permissions. I have the AppleCare Protection Plan and called them. Talked to them for over an hour. They couldn't help solve the problem. I have sound everywhere else but youtube. Any ideas on how to get sound back on youtube? Thanks.

Hi Marcia,
Does YouTube have sound in Safari?
Long shot, but...
Open Audio Midi Setup in Applications>Utilities, see the input & output options & KHz setting there, some things will change it for their own use, then not set it back.

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