Currently Being ModeratedFeb 7, 2013 11:30 AM (in response to moy1993)
Finally today I fixed my problem.
As you can read in my previous post when I connected the TV monitor to my Mac via the HDMI port, I had a black screen on the computer and "invalid format" on the TV.
I restarted the computer, connected to the TV, in safe mode, and the 2 monitors worked.
I opened Preferences> Monitor and I was able to adjust the resolution of the TV and now everything works perfectly.