Sound "output device" not recognized

Out of the blue I get no sound on my computer. I tried all sound preferences and it says that "no output device is found." I even tried headphones, but nothing works. The mute button is checked, but I can't uncheck anything. Everything's gray -- can't be accessed/clicked on.
Help! Thanks.

Welcome to Discussions - have you tried rebooting Also, take a look at the suggestions [here|http://docs.info.apple.com/article.html?artnum=300832] and see if anything helps. If you hear the start-up chime but no other sound, the problem might be what another poster, First Magus has suggested:
Your digital out has been turned on. You will also notice a red light in the hole when this happens. Use a plastic toothpick to reach into the hole and around the 3 o'clock position try flipping the switch. An alternate method that has worked for some people is to plug and unplug the earphones a few times. This sometimes resets the switch.
Please post back with results,

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