Stock 9600 Radeon G5 card causing ghosting on large monitor

I recently added a 1920 x 1080p 37" monitor from Westinghouse. It worked well until I unchecked the overscan option in the the OSX Display preferences. After checking it again it did not return to the crisp images I had before, but now has major ghosting. It is a new monitor but I tried hooking it to another apple with the same operating system and it worked fine. I reset the PRAM and shut everything down for awhile but no luck. It seems to have something to do with resolution preferences. The Display preference panel only shows a non-interlaced option. I noticed that the other machine (laptop) showed the same resolution but without the word "non-interlaced." Tech support at Westinghouse were surprised that the graphics card was using the monitor in a non-interlaced mode when progressive is preferred. It would appear that although my preferences didn't change regarding mode and resolution "192 x 1080 non-interlaced," it seems to have been operating in regular or progressive mode until I tried to uncheck the overscan option. At which time it actually switched to the "non-interlaced" mode. Please advise.
jmf

It is a DVI connection. The ghosting I'm seeing is like there is white light surrounding each text character. I don't have other user accounts but I can create one and try it. I will also try booting from the test disk and report back. It is odd that the G4 laptop, I tried it on, did have any thing about interlaced following the 1920 x 1080 resolution option. One thing that I did notice is that there doesn't seem to be any 'ghosting' around the apple icon (in the middle of the screen) or the small lines making a circular shape (indicating progress) on the screen during the initial stages of starting up.
jmf

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