No sound on YouTube in Safari

The sound on youtube performances has suddenly stopped working. I get no sound, either thru the iMac's speakers, or with headphones. Anybody have any ideas what happened?
Thanks,
T/

HI,
If your forum profiles is correct; 10.4.4, you need to update your system software. Click the Apple Menu/Software Updates.
After the udpates try uninstalling then reinstalling a new copy of Flash which is required for YouTube.
Uninstall Flash
Install Flash
Then Repair Disk Permissions
Quit any open applications/programs. Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select the FirstAid tab. Click: Repair Disk Permissions. When it's finished from the Menu Bar, Quit Disk Utility and restart your Mac. If you see a long list of "messages" in the permissions window, it's ok. That can be ignored. As long as you see, "Permissions Repair Complete" when it's finished... you're done. Quit Disk Utility and *restart your Mac.*
Carolyn

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