Internet sound won't come out of my computer??? HELP PLZ?

[AlyssaM]

I turned off my computer one night. The next morning i went to Youtube.com to listen to music and for some reason no sounds came from the internet. I went to the volume control thing and nothing was muted. I really need my sound working Help!!

P.S. The sounds wont work from the internet if im not on the internet sound will work!

 

[cnauta70]

Check to see in your system manager if the audio device is working properly. If there is an exclamation mark or a question mark beside it, then you need to reinstall your drivers for that audio device.