Thin black horizontal lines on 24" iMac screen/transparent dock icons

I have a 24" 3.06 GHz iMac (purchased in August 2008) and noticed after about a half hour of running basic programs (Mail, iTunes, Firefox) I start to get horizontal lines near the top and bottom of my screen. Then if I watch a full screen video I can see my dock icons look almost transparent through the video. I took my iMac into the Apple store last month and told them about it and they kept it for 3 days and ran their "tests" and stressed the computer out to get it to do it for them but they couldn't replicate the problem. They suggested that it might be my cordless phone is too close to the screen and the frequency of the cordless phone could be causing the problem but I tried moving the phone and it still does it. When the display is off for hours and I turn it back on the lines are not there, but once I have it on for a half hour they come back and don't go away until I power off or sleep the display. I've attached a few pics of what I'm experiencing. Thank you very much.
http://img.photobucket.com/albums/v626/xxbrankxx/IMG_0091.jpg
http://img.photobucket.com/albums/v626/xxbrankxx/IMG_0092.jpg
http://img.photobucket.com/albums/v626/xxbrankxx/IMG_0090.jpg

Since the Apple Store folks could not replicate the problem, you may want to consider a cause that is part of your particular environment.
For example, if you use a power strip (surge suppressor), what else is connected to the same power strip? Is it possible that you may have too many power-hungry devices connected to the same single wall outlet, and the iMac is not getting sufficient power? Or maybe it's some electrical interference with another device on the same circuit? As a test, try disconnecting everything else, and see if the problem recurs, or connect the iMac directly to a wall outlet by itself to see if the problem recurs.
Try moving the iMac to a different location in your home and running it to see if the problem recurs.

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