Hello I recently purchased a 2011 MacBook Pro and am trying to mirror my display to a TV via a mini display port adapter into a HDMI cable to TV. When I connect it, the TV says there is no signal (no input) on the input that the laptop is plugged into. I have been advised to go to "display" in the system preferences and enable it there but the problem is, it doesn't show me mirroring options in the display menu bar even when I have the box selected to "show me mirroring options when available" any ideas on what I'm doing wrong here? Any help is much appreciated