No audio. sound icon suddenly grayed out

A week or so after installing the Yosemite update, my macbook air went totally silent. The sound icon grayed out and the sound buttons show up a cross sign and there is basically no sound. Went to sound preferences and there is nothing in the output and input sections and the mute box is ticked and grey(can't be changed). What to do? this is ridiculous!

If there's a red light visible in the headphone socket, it indicates that the leaf switch is stuck. The leaf is pushed aside by the headphone jack as it's inserted and cuts off sound to the internal speakers.
Try inserting and removing the headphone plug a few (dozen) times.
If that doesn't work, you can attempt to tease the switch back with a non-conducting probe (plastic toothpick or similar).
And be careful; the leaf is fragile and it's an expensive bit to get to and replace, in fact on some models it's directly on the logic board.
Not sure how true it is, but at least one correspondent claims to have fixed it by cleaning the red laser with a Q-tip, on the theory that dirt on the end may fool the system into thinking a jack is inserted. Not convinced myself, but no harm trying it if you can't sort it the other way.

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Mac OS X: Gray screen appears during startup
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It could be Internet speed but at this stage I would doubt this at this stage.
10:27 PM Saturday; January 21, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Lion 10.7.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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Thanks for responding, no there is no sound from the headphone jack either. It seems like the problem started with the last update installation. A couple of weeks before that I had changed out the memory for a 1g in the upper slot. Everything else working well and memory seems to be happy. Those are the only two things I can think of that have gone on with the system. Internal speakers show up as the choices in sys pref and it switches back and forth from internal to headphone promptly when you insert/remove plug. The tex instr sound card is showing up in the hardware description in about this mac. Most of this detail may be meaningless, but figured there might be a clue in there for someone more clued up than I am.
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Try trashing the preferences with this free app as a first step.
http://www.digitalrebellion.com/prefman/
I had a slightly similar experience (but no black frames) a month ago, described here.
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Message was edited by: Ian R. Brown

No audio. sound icon suddenly grayed out

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