Screen goes to sleep CONSTANTLY

Ever since the week I installed Mavericks, my iMac display will not stay on.
It goes to sleep, even though my other monitor stays on.
When I give the command to 'sleep' my computer, the instant that it goes to sleep, and I hit the space bar (to reawaken it) the iMac screen comes back.
It generally won't stay on for more than 10 seconds - then it's off again, until I restart, sleep, etc.
Really frustrating.
Thanks

I've had this issue twice with my 2009 white MacBook.  Fortunately I still had the apple care support which expires in June!  The most recent occurrence was last week.  The inverter board had to be replaced and they actually ended up replacing my LCD this time.  Evidently its a faulty design with this model.  The repair was free to me, but I noted the cost on the invoice when I picked up my computer.  The inverter board and another part were a total of $75, and the LCD was about $300.   But like I said, the first time they did not replace the LCD screen, so it could be a minor repair. 

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