Cant connect MacBook Pro to LG external monitor.

I used a mini display port to hdmi cable that is connected to the monitor however, no signal is detected. I went to the display tab and it is says the 'arrangement' tab is hidden as it is only available when another device is connected.  This makes me think neither device is aware of the connection.   Can anyone please help?

Greetings rtmoms,
Welcome to the Apple Support Communities!
I understand that you are having an issue where your external monitor, when connected to your MacBook Pro, shows no video or signal. In this situation, I would recommend reading over and working through the steps in the attached article. 
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Cheers,
Joe

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