No sound?!

I stayed up late to see Tessa on TV. I DID see her - she looked adorable in her orange dress. However, for some reason several TV channels tonight have no sound at our house - huh? One of those, of course, was channel 5. I couldn't hear! It doesn't appear to be on the website, either. (sigh)

Comcast Cable, what is UP?! I hardly ever watch TV but when my daughter is on TV it doesn't have sound?!