What could cause my iMac 24 screen have 4 bars of translucent color across the total screen?

Question

Two days ago my screen got translucent bars going across the screen.  Every time I add and then remove a window I get a gost of that removes window is on the screen.  Also all the program Windows aer also translucent so it is very hard to work on it.    What causes this type of problem and how can I get this fixed in Fort Wane, IN.
HELP!!! Thanks,
Dick Anderson
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Answer 1

Thanks for your help.  The following are my resalts from the above test today 1/9/12 @ 12:00PM:
Added a different monitor =  Monitor Good, No problem.  iMack Bad, Had Problem at same time.    My test = Added my Epson LCD Projector (ELP-5550) at 800 x 600. The projector had a clear image on the slide screen.  At the same time my iMac had the above traslucent bars at this resalution of 800 x 600.
I did the above SMC Reset with no change.
I Did the PRAM Reset with no change.
My iMAC 24 Computer has the following specs:
Purchased date = 02/26/2008
Mac OS = 10.7.2
Processor = 2.4 GHz Intel Core 2 Duo
Memory = 4GB, 667MHz, DDR SDRAM
Graphics = ATI Radeon HD 2600 Pro256MB
Display Resalution = 1920 x 1200
Pixel Derpth = 32 Bit Coloe (ARGB8888)
Bus Speed = 800 MGz
Would it be better for me to purchase a new 1920 x 1200 flat monitor and put it in front of my iMAC or try to get this fixes?  If I need to get it fixed, were is a good place to get a quote?
Thanks for your HELP,
Dick Anderson