Youtube/Flash videos play but with no sound

I have gone through other posts both here and elsewhere trying to fix this issue.
It happened, so far as I can tell, after the most recent set of updates that I installed (less than a week ago; my computer is set to update every month). Youtube and any other Flash videos online will play the video, but the sound option has a red x on it and does not allow me to have any sound with the videos. This occurs both in Safari and Firefox.
Videos played through Quicktime (even .flv files downloaded from Youtube) play just fine, without any problems at all.
I have changed the Audio Midi settings, uninstalled/reinstalled Flash player (and repaired disk permissions), reset PRAM, opened up Garageband/Quicktime/All other audio programs, and to no avail.
I am running 10.6.6 on an iMac G5. My other iMac G5, which had the same set of updates installed, does not have this issue, which makes it even more baffling.
I am almost to the point of backing up the computer's contents and doing a clean install of the system, but that seems like an overkill solution.
Any assistance would be appreciated.

Hi and welcome...
Try deleting Flash cookies.
http://machacks.tv/2009/01/27/flushapp-flash-cookie-removal-tool-for-os-x/
Restart Safari.
Carolyn

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