Macbook pro does not detect TV

Hi,
I have macbook pro Mid 2010. It used to work fine with Sony Bravia TV but today when I tried it was not detecting my TV.
I do not see any "Arrangements" tab under System Preferences -> Displays. Here are my macbook pro details:
Processor  2.53 GHz Intel Core i5
Memory  4 GB 1067 MHz DDR3
Graphics  Intel HD Graphics 288 MB
Software  OS X 10.9.5 (13F34)
I tried to reset PRAM but no help. Any suggestions on what may be happening?
Thanks,
Gaurav

skn2011 wrote:
My Macbook Pro notbook 13.3" does not detect external display throught it's mini display port to HDMI connector when connected to Sony Bravia 32" LCD TV.Can anyone help me get the answer as i tried reading everywhere on internet and none does not seems to work.Please help me out guys.
Are you using the Apple adaptor or a 3rd party

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