This may not be the best forum, but I'm not sure which fits.
Yesterday morning I played You Tube videos and all was good. Yesterday afternoon the picture was good but there was no audio. I have checked:
Audio good in Windows media player.
Audio good in videos on other sites.
If I download a video, no audio while it plays, but the downloaded video has audio when played.
The advertisement at the top of the first You Tube page has audio.
I uninstalled and reinstalled Flash player.
I did a system restore to when it was known to work.
I tried a second computer: No audio.
I went to YouTube on a wireless BluRay player: audio good.
Any ideas?