Macbook (m2009) to Samsung tv stopped working!

Please can someone help with this:
I have a Macbook Pro mid-2009, running Yosemite, NVIDIA GeForce 9400M 256MB, with 2.8ghz Intel Core 2 Duo Processor and 4GB RAM. I have had a connection via mini-DVI - HDMI converter to a Samsung TV for the past few years. Despite upgrading to Yosemite, I continued to have a perfect picture. Then yesterday my connection had an error with the Samsung tv reporting "mode not supported". I have tried all the different monitor settings in the preferences menu, restarting the computer with and without the tv attached, restarting in safe mode, resetting the SMC and PRAM, updating the graphics driver to the latest version and also replacing the converter. Nothing has worked! what I don't understand is why it was working one minute and then not the next. Please can someone help me! I miss streaming my favourite shows to the tv!!
best wishes
Gavin

Hello there, evelyno.
The following Knowledge Base article offers up some great information in regards to troubleshooting issues with not seeing AirPlay options don't appear:
About AirPlay Mirroring in OS X
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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