On Sat 22 Apr 2023 at 18:30:56 (+0100), mick.crane wrote: > I suspect the GPU is suspect because there are small blocks of pixels > appearing where they aren't wanted. > I'd like to re-install the OS as I've got copies of everything I think. > Just to see if it's maybe a driver issue. > Thing is I can't get the f12 options screen of the PC to let me boot > from a CD in this EFI mode what's grub done. > How can I boot from CD in this EFI mode?
You try other keys besides F12. You tap them repeatedly after turning on. You try them in combination with Escape. There are usually a number of features on different keys, like: F1 System Information F2 System Diagnostics F7 HP SpareKey F9 Boot Device Options F10 BIOS Setup F11 System Recovery Cheers, David.
