Bizarre hardware

Greetings,

I bought a new PC last week, but I couldn't get it to install Gentoo. The first 
hurdle was to get SystemRescue to show its X display. I never did find the 
trick, and now the thing is going back for a refund.

I tried the Gentoo live CD image, which ran fine with a Nouveau graphics 
driver, and used it to query the hardware. The usual 'lspci | grep VGA' 
returned three interfaces! One Intel, one Nvidia and a third, dormant device. 
I've heard of dual interfaces in a laptop, but not a desktop, and certainly 
not three.

I also tried installing Gentoo from that image, and all seemed to go well 
until it was time to boot the new system, using grub. It couldn't even find its 
NVMe hardware; I don't mean a device connected to it but the interface itself. 
Then, giving that up, it went on to fail to find the USB interface as well.

The machine had been designed to ship with Windows, but I specified No 
Operating System.

Can anyone shed any light on this?

-- 
Regards,
Peter.