Why does my 08 iMac display flashing and partial window problems?

I have a 2008 iMac with OS X 10.9.2 with 4Gb memeory. In the past week we have experienced partial windows pop up and have unable to close the windows. The problem is resolved by restarting the computer. This has happened about four times in the last week. Today I was using a window and notice flashing when I clicked the mouse with partial windows I had been using previously began appearing on the screen. Any input would be appreciated. Up until this point I have had no problems with this iMac.

Update - I spent a half hour on the phone with AppleCare this morning and we were unable to resolve the issue. I then took both my display and iMac to the Apple Store today and the Genius Bar not only replaced my iMac - they replaced my 24" Cinema Display with a BRAND NEW 27" Cinema Display! The Genius said that Apple's engineers wanted to research why my display was flickering using the exact display and iMac. Incredible service! And a brand new display!

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