On Sat, 08 Jan 2022 16:48:26 +1000 Michael D. Setzer II via users wrote:
I've noticed for a while running memtest from grub2 menu just gives a blue screen and locks machine.
Memtest and EFI seems to be tricky. I had to download the EFI compliant memtest86 (NOT memtest86+) and make a bootable usb stick to run memtest on a new EFI only system I got.