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On 01/08/17 11:39, Adrian Midgley wrote: > Looking back the latest death occurred before the BIOS was told to be > less optimistic. This all sounds suspiciously like yet more confusion between ye olde BIOS+MBR setup and the new fangled UEFI+GPT method, which Debian specifically moved to embrace with their latest release. The Stretch installer will try to go with the new, preferred method by default which I think is where you may be running into problems (quite aside from any related potential hardware issues). It won't explain why your system was so crashy with the fresh Stretch install but would explain why it no longer boots. For your next attempt you'll probably have to finally make the choice between the two setups - you can't (really) have both. This requires both hardware changes and specific software configurations in unison to work properly, and if you for example change the BIOS/UEFI operation mode afterwards (for example, defaulting or resetting it) it's fully expected behaviour that your system will no longer work! I'd recommend turning ON all the modern options in your PC firmware - switch it to exclusive UEFI mode if possible and abandon BIOS once and for all. Your SSD will have to be nuked during install and relabelled as a GPT format disk instead of MBR - be warned, Debian can often make this unclear or just flat out fail to do this during installation. You may be better off booting a gparted live disk or similar to manually relabel the disk, or just use gpart/parted/cfdisk if you know them. You'll end up with a ~500Mb FAT32 formatted EFI bootable partition at the start of your disk which will be booted by the UEFI using Grub2 and it's EFI extensions: it will no longer boot at all in BIOS mode. Apologies if I'm barking up the wrong tree here but it really sounds like this is at least part of the issue! Everyone is increasingly going to start running into this as PC hardware and Linux distributions slowly evolve and modernise. Obviously this doesn't explain your other problems but a good start would be building a fresh working Stretch install on that system on a solid, non-flaky base. Cheers -- The Mailing List for the Devon & Cornwall LUG https://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq