Display help

I have a HDMI to thunder port cable and I have mu Macbook pro hooked up to it and trying to mirror to my tv but I cannot choose a different display then my built in, and the F7 is not working to switch it like it says to do in instructions, What do I need to do to fix this issue

Hi Raven4EverMine,
It sounds like you have your television connected to your MacBook Pro via an HDMI to Thunderbolt adapter and you aren't seeing any video on your television. I would recommend you use the troubleshooting in the following article about that kind of issue:
Apple computers: Troubleshooting issues with video on internal or external displays
Thank you for using Apple Support Communities.
Take care,
Sterling

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