Sorry to necro an old thread, but having not seen any updates or real resolution on this, I’m experiencing the same issue.
Motherboard bios (Asus Z590-P) has the primary graphics set to CPU, which my I5-10600K does support, but the only way that I can use a connected monitor is by plugging it in to one of the outputs on a GPU; using the motherboard output only results in showing the blue HiveOS loading screen, then the monitor goes black with “no signal detected”.
I’ve also tried setting the Worker Options to enable as well as disable the GUI, with no change to the result. Does anyone have a real fix for this?