On Sat, Apr 22, 2023 at 01:14:12PM -0500, David Wright wrote: > 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:
If you can tell us what model of motherboard this is, we can maybe tell you what key. If you have another Debian machine somewhere, use dd to write a netinst.iso to a USB stick and boot from that? Many old machines respond to DEL key tapped repeatedly on first booting up F1 / F5 / F7 are all possibles: F12 is usually for a one time boot You may need to set priority order for BIOS/MBR/Legacy and UEFI boot order separately. > > F1 System Information > F2 System Diagnostics > F7 HP SpareKey > F9 Boot Device Options > F10 BIOS Setup > F11 System Recovery > > Cheers, > David. > All best, as ever, Andy
