I have a 2012 MacBook Pro and have been running into issues getting the HDMI to work on my Samsung Smart TV. I have a thunderbolt to HDMI adaptor that's been working flawlessly, then one day it stopped. When I hook everything up, the laptop goes into the mirroring mode and under the displays, acknowledges that it is hooked up to a Samsung TV, yet the TV screen remains black and has a no signal message. Since the MacBook recognizes the TV, I'm inclined to think the cable isn't the issue, but could I be wrong? Any suggested fixes?