External display mirrors but will not work side-by-side. What is wrong?

I am using a VIZIO HD TV as a second display . Setting the TV to 1920 x 1080 (it's max) and the iMac to 1920 x 1200, the two displays work correctly in the "Mirror" mode. When I set the "Arrangement" to side by side to create another display space, the TV displays the Invalid Mode error. The behavior does not improved when the two displays are set to lower resolution levels. This same TV works fine in all modes when connected as a second display to my Mac Book Pro.
Any ideas?

I apologize to everyone who is following this but I have a dilemma which I think Mr. Brody may be able to solve and I know of no way to contact him other than the forum.
Mr. Brody, you may be the "Geek" (compliment) I am desperately looking for, No one in our area .. and AppleCare (on all three of my units) has no answer.
I added an ASUS VH198T 19" monitor for viewing tutorials while working in Adobe Lightroom and Photoshop. DVI to mini for iMac. The ASUS runs at 60Khz and 1440x900 where the iMac is, of course 1680x1050. Each time the ASUS goes to sleep is closed, when it restarts, the iMac apparently sets it to one of it's standard resolutions 1600x900, unfortunately that's a little higher so I get flashing of the ASUS and ... WEIRD > Magic Mouse goes nuts with pointer jumping all over. Apple had a tech come by for the Mouse, wouldn't even consider the monitor, not an Apple product. Tech found nothing. I have talked with ASUS several times, they say it is the Mac and I now think they are right, especially after they sent me a replacement under terms of their warranty, very generous. It does the same! Both monitors work on our Xp Laptop, it lets me set the resolution to whatever I want.
When 'mirrored' the resolution IS set to 1440x900, works fine when return to individual UNTIL the next time it sleeps or turned off. Any suggestion???
Can Terminal allow a change from 1600 to 1440?? If so, how?? I'm not Linux or Unix literate, among other things.
Will most gratefully appreciate,
Ed in Pensacola

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Copy the 10 lines below (highlight and ctrl+c or right-click and copy)
regsvr32 /s softpub.dll
regsvr32 /s wintrust.dll
regsvr32 /s dssenh.dll
regsvr32 /s rsaenh.dll
regsvr32 /s gpkcsp.dll
regsvr32 /s sccbase.dll
regsvr32 /s slbcsp.dll
regsvr32 /s mssip32.dll
regsvr32 /s cryptdlg.dll
regsvr32 /s initpki.dll
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3. Hit return
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External display mirrors but will not work side-by-side. What is wrong?

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