So yesterday I was able to watch flash videos on YouTube perfectly fine. Today when I try to play any video the audio is so low that I cant even hear anything. I'm able to play music from Itunes and I can hear my friend perfectly fine when talking with voice chat, so my headphone and speakers aren't broken. I tried to uninstall then reinstall Flash player but that didn't help anything. I'm stumped as to why I cant hear anything on videos. Any help would be greatly appreciated, thanks. Edit: okay, so i have no idea why I didn't check this but i think my friend muted the volume on Firefox and now I can hear everything fine. Sorry for any in-convince.