Connecting HDTV with mini displayport with HDMI cable dos'nt work

MacBook pro 15" mid 2010 when connected is nothing to see on HDTV. Could you give me some advice? thank you

Did you look at System Preferences>Displays?  Does the category 'Arrangement' appear?  Did you click on 'Detect Displays'?
Have you examined the instructions that came with your TV?  There should be settings for  an external PC/computer.
Ciao.

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