Tonight I had my Intro to Networking class, and I took my laptop as I always do. I mute the sound so that no unexpected ad noise will disrupt the lecture.

A few minutes ago I went to listen to a song on youtube; I tend to forget I have the sound muted from class until I start the video and tonight was no different. So I unmute the sound but the video is still silent. I tried refreshing and going to different video(in case the sound was removed for copyright, that happens sometimes) with no success. The other video was also silent.
I then tried an episode of True Blood which I have been streaming(so like youtube it also plays directly from the internet). No sound there either.

I tried my DVD which I currently have in, and THERE the sound is fine. So it’s not MY sound. Somehow it’s only the sounds that come directly from the internet.

My laptop did freeze for a moment when I had first set up in class, and I had to control/alt/delete to get it to work again and a few minutes ago my internet connection got lost for a moment. A connection loss is harmless but I wonder if the freeze earlier did something? That’s never happened before btw, it freaked me out.

Does anyone know what happened. Up until now it’s been fine.