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I have 2 HP Z27 monitors.  They worked for awhile, then suddenly stopped working all of the sudden -- at the same time!  

 

They will still display via HDMI - just not via USB-C anymore.  

 

They used to work via plug and play.  Now they do not receive a signal.  

 

I have swapped cords with no luck.  

 

Does anyone know how to fix this issue?

 

Thanks!

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