Why is sound no longer working with MBA?

The top right sound icon is no longer available eventhough system preferences has shown volume in menu bar ticked. In systems preferences, the sound is on mute and cannot remove the mute so there is no sound. In output devices, no output device is available. This is also for input devices which means I can no longer listen to iTunes or use skype.
Can anyone please help? this is a major cause of pain:(

My MBA had no sound for a while, there were no hardware to choose/select in the system preference nor in About this MAC option.
I've tried everything possible (other then sending it in for repairs) to restore the sound.
I've tried all of the options suggested in forums etc.
1. Reset the NVRAM = no success
2. Reset the SMC (System Management Controller) = No Success
1. MacBook Air
A. If the MacBook Air is on, turn it off.
B. Connect the power adaptor to a working power source.
C. On the MacBook Air keyboard, press (left) Shift-Control-Option along with the power button once. Note: You must use the keys on the left side of the MacBook Air keyboard.
D. Wait 5 seconds and press the power button to start the MacBook Air.
3. Ran Apple Hardware Diagnostics = No problems found.
Well long story short. I had order a hard shell cover for my MBA. During the process of snapping on my cover, my sound came back! I couldn't believe it, I thought it was from something other than the MBA. I realize during the process of putting on the shell cover, I had to apply pressure at specific points on my MBA. I applied pressure to each location where the cover had a snap lever.
I believe this pressure may have push in the cabling / pins for the sound card. Since then I have not loss my sound capabilities.
I thought it might have been a fluke. Therefore I shut the MBA down and restarted it and I heard the startup sound. I did this several times to ensure it was working properly.
So far it has been two weeks and sound still works!
What do you have to loose? Try applying pressure (not too hard though) on the sides of the MBA, along the left and right sides of the monitor and the left and right of the keyboard. It may or may not work, but it is worth a try before sending the MBA in for repairs.
Good luck and I hope it works for those who are having sound problems with their MBA.
Regards,
I Am Webhead

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