Imac air powers up but no display.  Apple light is on; laptop is warm on bottom. No screen and no ability to turn off.

I turned off my iMac Air last night as normal and had it hooked to the power charger because the battery indicator was low.  This morning I pressed the Power button and nothing.  I pressed a couple more times and I heard the start-up chime.  The Apple insignia is lit; the bottom of the computer is warm.  But no display and I can't seem to turn the laptop off.  I've tried hitting the power button several times but nothing happens.  I'm stuck.  Help please.  Thanks, John

So I waited a couple of hours with the Macbook Air unplugged.  After two hours still noticed the Apple logo was "on" and the bottom of the laptop was warm.  Pushed the power button a couple of times and the machine turned off.  I pressed the power button again and heard the startup chime.  I did this while holding down Option-Command-"R"-'P" (no easy task).  The screen came on, very fuzzy at first but the cleared up.  Wanted to know if I wanted to reinstall the OS, restore a backup or just restart.  I took the simplest approach and restarted.  The system rebooted fine.  The display is back to where it was before.  Needless to say, I immediately backed everything up to iCloud just in case this happens again. 
Anyone have any suggestions or advice?  Thanks, Papajohn-Philly

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