Only thing I've done that is unusual is today plugging in a VGA to HDMI cable from PC to TV. Didn't work, but restarted my computer while cable was plugged in. That's the only thing out of the ordinary lately.
Videos play fine from my hard drive. I'm downloading newest version of FF, but I don't think that's going to help. Any ideas? This doesn't sound like any of the problems I saw previously listed in the forum.