Suddenly, no YouTube sound

I have iMac OS X 10.5.8 purchased 2009.   Today I find that YouTube videos, whether played through facebook or directly on YouTube, there is no sound at all.  I went to Flash website and uninstalled my Flash player, although I did have the current one.  I reinstalled it, and still no sound.  What do I do now?

Ugh, I meant this (I couldn't edit my previous post):
cd ~/Library/Preferences/Macromedia/Flash Player/macromedia.com/support/flashplayer/sys
echo -n '' > settings.sol
chmod u-w settings.sol
It makes the settings file read-only.

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