Thank you, Stefan.
BIOS System shows NVIDIA GPU UEFI Driver (80.04.E8.00.21) but BIOS Device Configurations does not show "Hybrid Graphics" or any other Graphics options.
WIndows 10 clean installation necessitated a change of drive format from MBR to GPT and a Boot Option change in BIOS from Legacy to UEFI Native. Can't imagine that this might have had an effect on card detection.
Still baffled that the Intel HD Video Graphics card is not recognized at all.
This message was posted on behalf of Intel Corporation
Looking into your case I see that your Intel® HD graphics is not recognize; as mentioned by Stefan 3D seems that this has to be changed on BIOS we can try to load default BIOS settings with F5 (most likely) or configure bios with to use both GPU in that case we recommend to contact the system manufacturer.
Thank you for your suggestions.
BIOS has been reset (a couple of times). And all available updates have been tried out. Intel HD video card still does not show up.
It starts to look like a hardware fault that coincided with the BlueScreen event following the Spectre security patch bug.
I ran System Diagnostics but hardware problems are not reported.
Is it possible that a malfunctioning video card is not reported and does not register at all?