Why is the audio suddenly silent on my macbook pro?

I have a MacBook Pro using Mountain Lion and I am away from home, using wifi in a hotel. I just discovered that the audio is suddeny silent when I go to YouTube or any other video or music site. Any idea what's going on and how to fix it. I have turned off Time Machine while here.

Hi skymichelle,
If you are having sound issues with your MacBook Pro, you may find the following articles helpful:
OS X Mavericks: Reset your computer’s PRAM
http://support.apple.com/kb/ph14222
Apple Support: Troubleshooting issues with no audio from built-in speakers on Macs
http://support.apple.com/kb/ts1574
Regards,
- Brenden

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