Mac Book Air Backlight Turns Off

A few times the backlight for the display of my Mac Book Air has gone off (for seemingly usual reasons) but then does not come back on in response to keyboard input.
The display works because you can sort of see silouettes of movement on the dark screen, but no display back light.
Has anybody encountered this problem?
The laptop works great 99.9% of the time, so mostly I'm wondering if the backlight problem is something others have experienced that might get worse and that I should have somebody look at.
Moving the power cable around at its connection point or pulling it out and snapping it back seems to fix the problem, maybe because the change in power clues the software to change the intensity (or maybe there's a loose wire near the power connection?).
While a bit anecdotal, it seems more likely to happen when there is a light breeze blowing down on laptop from an Air Conditioning vent about 8 feet up on the ceiling (as is one of the tables I work at occasionally, and the vent is the only difference I notice from other areas where I work... maybe just coincidence).
I would take it to the store for an opionion except I cannot reproduce it on demand yet, it just occasionally happens.
Thanks for any info!

OS X version?
Startup in Safe mode
http://support.apple.com/kb/PH14204?viewlocale=en_US
Repair Disk
http://support.apple.com/kb/PH5836

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