Question Z390 Gaming Plus - no display when I plug in GPU riser ?

You can't get a display without a graphics connection and adapter.
I suspect you mean that you do get a display when the monitor is connected to a motherboard adapter and a supporting cpu.

If you plug in a riser without a gpu attached, possibly the motherboard thinks you have a gpu connected and is automatically switching graphics to the empty pcie device.
Look in the bios to explicitly select the integrated adapter.
 

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