Sloppy video card
The PC that had this Nvidia GTX 670 graphics card in it refuses to start
any recent variant of Linux I try on it via a USB live installer, it
shows the boot/BIOS and splash screens OK but ends up with a black
screen or garbled graphics. Still not sure if it's a hardware or driver
This is the side of the GPU PCB facing upwards in the tower:
Looks like thermal grease dripped all over it from somewhere. Related?