I would try factory resetting it. Usually there’s a pinhole to do that.
Can you re enable it if you dont have a 2nd video output device without wiping the firmware settings? On my old PC the graphics card died but could still get into the BIOS using it. I accidentally disabled integrated graphics so when I removed the graphics card I had no output anymore.
I would have gotten a G series if they didn’t have lower performance since I want to use VFIO. Having two video outputs is the easiest way to do it.
Otherwise you can soft reboot the GPU. Doing that use to require a lot of tricks on top of an already complicated process.
Reveddit works though