How do you rid your display of a 1" grayed area?

How do you get rid of a 1" grayed horizontal grayed area ?

The 4,1 iMac came out in Jan 06, so it is 6 years old. It wouldn't be surprising if the video card (or other component) is failing. If you haven't restarted try that. Also try a Safe Boot (hold down the Shift key during start up) and after it has fully booted restart again normally (no Shift key). That clears some caches (don't worry what that means). This is to rule out some possible corruption from when you played the Big Fish games. Many simple games like that use 256 colors and in the process of launching change the resolution but then on quitting the game tells the iMac to reset itself to it's normal millions of colors.
Also try this - launch Disk Utility (in your Utilities Folder) and Repair Permissions. Also in Disk Utility click Verify Disk. If problems are found, click Repair Disk.
If none of that works there is an Apple Hardware Test as well. Is there an Apple Store near you? Might be time to take in for a proper diagnosis.
PS - Clicking "Correct Answer" or "Helpful Answers" is usually done on the post of the person(s) who write such answers, not for you to mark your own post.

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