MacPro will not connect to TV

I am running the latest softwarre 10.8.5 and my computer will not even recognize the television. I plug in the adapter my computer screen goes through he blue screen phase but not my tv. Once i go into System Preferences and Displays i dont see the option to connect to my tv. I dont know what to do. My sister has a mac also and i dont think shes running 10.8.5 and her computer will connect fine to the TV.

Hello
I have the same problem as I_NEED_HELP_Q_Q
It worked fine for more than six months, since I upgraded to 10.8.5. it doesn't working anymore. My monitor goes through blue phase, but TV remains black. System preferences/ Display doesn't find TV.
I'm connected to the TV via mini dvi port with adapter to HDMI cable. I have MacBook Pro 13 mid 2012.
Any ideas to resolve this problem with my setup?
Thanks.

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==========                ======                        =======                                                                               ========            =====
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