New 27inch iMac, external Display "blinks" while in "Display Sleep"

I just updated from a 24inch iMac to a 27inch iMac.
I'm using the same setup for connecting the external display, which is a miniDisplay Port adapter(from Apple) to DVI, then DVI to the external monitor.
All works fine until the "Sleep Display" kicks in, then the external monitor pops up the "DVI-I no signal" warning.  This is normal but instead of going away after a couple of seconds it begins to blink as if their is communications going on between the monitor and iMac.  So its blinking this message endlessly and thus the external monitor never really goes to sleep.
Since this worked fine on the iMac 24inch, I'm assuming it has something to do with the "Thunderbolt" port, using a miniDisplay port adapter.
The external monitor is a 20 inch Viewsonic VP2030b, running at 1600x1200.
I added a YouTube video for clarity.  http://www.youtube.com/watch?v=Q7Zm_U_7sbc

Go to: System Preferences > Displays select the Color tab > uncheck "Show profiles for this display only" and try one of the RGB profiles to see if it is better for you.
Then if you are not happy with one of those..? Try Selecting, Calibrating and Saving a different Profile, other than the default one offered for that monitor.

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