Display mirroring not working with my TV once I installed Yosemite. Any help?

I just installed OSX Yosemite v 10.10.1 onto my 2012 MacBook Pro. I have been using the mini port to use an adapter so that I can display my screen onto my TV. Once I installed Yosemite, it is no longer working. Any suggestions? Is there a plug-in?
Thank you David

Every day I like Apple products less, may be Apple had secretly merged with the garbage maker the new name is Applesoft. I purchased this adaptor  for my iphone 4 two weeks ago, it was working ok, except the occasional annoying message  "this accessory is not optimized for this iphone", but this is an Apple product, W.T.F?
Yesterday, it suddenly completely stopped working, I am sure it's not because of my HD monitors and TV, because I tried on four different HD TVs, I updated to iOS 4.3.3, nothing seem to work. for a $40 dollars tiny cable it seems like a big rip off from Apple just like they did with the $39.00VGA cable(which you can get for $2.00 on eBay) except it would not pass the Apple's so called "optimized" rip-off I am going back to Apple today to see the so called "Genius" and demand they give my money back and give me a working cable, they have to compensate me for wasting my time!!

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