ThinkPad Yoga won't connect to external display

I just received a ThinkPad Yoga and have not been able to get output to external display.
I am using mini hdmi to display port.
Lenovo tech support was completely useless.
Does anyone have experience with this issue?
Thanks

First, try resetting the parameter RAM:
Hold down keys CMD-Option-p-r on startup until you hear the second chime.

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