Still having trouble with audio on Macbook Pro

I had posted a discussion board earlier on this issue. I've been having trouble with audio for certain videos on youtube and basically any website embedded with a video. The audio works for a few seconds that doesn't or it doesn't work at all. My volume is up, not on mute, and the one on the video isn't on mute either. It's funny because I just tried watching a video on Firefox (as opposed to Safari) and it works. Could it possible be something with the settings for safari?

Try restarting your Mac, resetting your router, and resetting your modem. My cable internet has gotten slow at times as well, and when I reset my router everything cleared up.