My MacBook Air displays no wifi on hard drive, now after shutting down, it won't turn on at all

Started up computer this morning and no wifi, so I clicked on diagnostics, and it said no wifi on hard drive. I could not even click "turn wifi on" in system preferences. I then shu down computer to try and start all over, but now it won't even turn on at all.
A virus maybe??? Please help!!

Reset PRAM.  http://support.apple.com/kb/PH4405
Reset SMC.     http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
If this does not help, contact Apple.
Best.

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