Thanks for the question. I understand you are experiencing issues with AirPlay Mirroring to your Apple TV. The following resource provides relevant troubleshooting information that may help to resolve your issue:
A number of users on the forums refer to the Mac Pro when they actually own a MacBook Pro notebook computer.
While that 65lb weight is a bit high for the 2012 model's actual weight, it was accurate for the previous Power-PC towers, and gets the point across that I am not talking about any notebook computer.