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input not detected msg when using more than 1 port (display and usb)

HP Recommended
Pavilion 32" LED QHD Monitor

I am using a MacBook Pro in clamshell mode with the DisplayPort cable. When I plug in the usb keyboard, the keyboard doesn't work and/or the screen goes black with an error message saying that no input is detected. 


Also, not sure this is posting to the right board.  There are no options for displays/monitors.  Can someone point me to the right place?

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