I can't hear the Audio on any YouTube video!?

My speaks are on, it's not on mute, the YouTube volume of the video is as high as it will go. I don't have headphones plugged in....but I still can't hear anything!

What's wrong?

Ohh, and I made sure it wasn't my computer, because iTunes works fine!
Update: Yeah, it doesn't say the Copy Right thing below it, and I wasn't watching music video's =S
Update 2: Ok, it's working!
I turned my computer off then back on....and it worked =]

Weird. . .
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