Thunderbolt port to Mini Display Port to HDMI problem

Ok.. I figured it out (after reading another post of 44 pages of solutions/non-solutions and complaints starting back to 2009 and trying some) It seems as though a simple fix was missing....  I did this and it works just fine...
I have a 27' imac. I used the Thunderbolt port on the back to a MDP to a HDMI to my 55" Vizio HD 1080p TV. It didn't work until......
I called my Boeing engineer son-in-law (who is a very part time mac person (but very smart!) and he had me go to (SEE steps below!)........
I did this and it works just fine...
HERE IT IS STEP BY STEP!!!
1.Open SYSTEM PREFFERRENCES click DISPLAYS. A window opens that will say your mac on the top of the window (mine said- iMac).
2.Then....click ARRANGEMENT (there will be 2 little blue screens inside--1 portrait and 1 landscape view) and check MIRROR DISPLAYS.
3.Now a second window opens with the name of your other display (mine said- VZ55.....which is my TV)  (the two little blue screens will now be overlapping).
4.Then go to DISPLAYS on same window and choose your RESOLUTION.
5.Now arrow pack on window to SYSTEM PREFFERRENCES
6.Click SOUND and click on whatever your other display is (mine was VZ55....). 
7.Choose your resolution (mine was 1080p) and ****POOF****  there it was.... my computer on my TV!!!
WALLA!
I hope this will help a lot of you! Good Luck All! 

Shoudl try deactivating "Automatic graphic switching" from "Energy" pane of system preferences ...
As said on the following : http://forums.macrumors.com/showthread.php?t=1297176

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