There is no audio output on my MBA in the system preferences-sound folder. Therefore no sound comes from my computer. At the same time this happened, any streaming video stopped playing after 11 seconds, as well as iTunes will not play any song. Help!?

Hello everyone.
i have a 15" MBA circa 2011 running Lion 10.7.5 and my sound has gone, There is a no sound circle on my volume display and in system preferences sound my options for output is empty. At the same time this happened I noticed 2 things: 1) itunes would not actually play any audio track and every video i streamed stopped after a few seconds (usually 11s) but not always.
I have tried following some tips I have found online like going into MIDI and fixing the problem there, restarting in safe mode. Resetting with PRAM (or something that sounds like that).
Does anyone have any insight on this? At this point i'm thinking it's time to reload Lion but I don't really know how to go about that without losing all of my files.
Please Help
Thanks

Hello JaboorMBA2011,
Thank you for using Apple Support Communities.
For more information, take a look at:
Troubleshooting issues with no audio from built-in speakers on Macs
http://support.apple.com/kb/ts1574
Have a nice day,
Mario

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
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There is no audio output on my MBA in the system preferences-sound folder. Therefore no sound comes from my computer. At the same time this happened, any streaming video stopped playing after 11 seconds, as well as iTunes will not play any song. Help!?

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