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Previously working installation of Catalina no longer boots


PhoebusGR
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Hello there !
After a few weeks of not using catalina because I couldn't make my iGPU work (i5-6400+Asrock H170 Pro4/Hyper), I decided to boot again to start fixing issues but to my surprise my installation no longer booted.I recreated my bootable USB using Clover, and that doesn't boot either ! 

Does anybody have any idea what I'm doing wrong? I suppose first thing to look for would be modified BIOS settings interfering.
Thanks for replying, have a nice day

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External drives? Like from USB ? No, I have 1 NVMe and one SATA III (SSDs).
I would like to show you my verbose but unfortunately when I open UEFI boot menu, neither work (old installation/bootable USB) when I select one of these, screen goes black for 1 second and then returns to boot menu.Nothing happens essentially, I cannot execute verbose.

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