I've got one system with a GPU in it where I don't use the GPU for screen output (it doesn't have the right sort of connector for the KVM switch I use). I had to update settings in the BIOS to make it use the onboard graphics for screen output. That might help.
Alternatively I would just SSH into the system and do all admin etc from the command line. Possibly plugging in a monitor etc to do initial setup, then run it headless.
Chris
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