IE
Browsers: IE11 uses Adobe Flash Player (at least on my system). Google Chrome uses HTML5.
Its been my experience that Adobe Flash is buggy when its not updated. Worse, if you had the bum rush of Windows updates applied this past week and your player was already out of date, you may have created the problem by not letting the updates run (been there, done that myself).
You can go here http://get.adobe.com/flashplayer/
to update Adobe Flash Player if youre using Internet Explorer (IE).
I have so many browser problems these days on different websites that I installed Google Chrome as an alternate browser (the others, Opera etc., dont seem to work as well). Id recommend Chrome if you dont have it.
If you have another browser to try, my bet is you would have sound.
Hopefully the update fixes it since youre in IE.
Merry Christmas!
Now I remember: for IE
Tools, Internet Options, Advanced, play sounds on web pages.
See if that’s it.