Display noise after using VGA projector

I taught two terms at the university using my MB Air 2012 with a VGA projector. Each time I connected the Mac to the projector and took it off, there was random noise on the display. I considered it as normal. Now the lessons are over and I don't use the projector any more. However, every time I turn on the Mac and when I shut it down, I see the same noise on the display. Otherwise, there are no problems.
Is there a way to get rid of that noise?

Reset PRAM: http://support.apple.com/kb/PH14222
Reset SMC. http://support.apple.com/kb/HT3964
Choose the appropriate method.
"Resetting SMC on portables with a battery you should not remove on your own".

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http://support.apple.com/kb/HT5369
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Display noise after using VGA projector

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