Screen flickering, then solid grey

Ugh, hopefully someone can help.  My 2012 IMac running 10.9.3 all of a sudden today, screen began to flicker like crazy.  I then turned it off, tried again and for a few minutes worked as it should.  Then, screen flickered again and then solid grey.  Turned off again and it repeated the cycle.  I do not have applecare so am hopeful it's something basic.  Any ideas. thoughts?  Thank you

I would start troubleshooting by going to Apple's Mac OS X: Gray screen appears during startup article located at:
Mac OS X: Gray screen appears during startup
Follow the steps methodically and if the machine still will not work correctly after going through each and every steop then the last step says to take it into your local Apple Store or AASP.

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    http://www.apple.com/retail/geniusbar/
    Before you do costly repairs on an old Mac compare it to the cost of a new MacBook Air. Apple recently dropped the prices on the MacBook Airs by $100. Best Buy has been offering additional discounts on the Air. Prices start around $850.
    http://store.apple.com/us/buy-mac/macbook-air
    If you do purchase a new computer, get 8GB RAM. RAM is soldered in and you can't upgrade later.
    Check out Apple's Special Financing link.
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