Hi so i tried booting the latest Beta for Bluefin LTS and it just stayed on the underscore blinking screen and it stopped blinking but i waited and it didnt boot.
Maybe you are not in UEFI mode?
But anyways, I recommend you to read this: Call for Testing: Bluefin LTS (Alpha) - #66 by j0rge
before going any further
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Do you only have Bluefin installed or do you dual boot with other operating systems present on the system? Also, did you try booting to other boot entries on the GRUB menu?
This is due to centos 10 dropping the x86_64/v2 architecture. T420 likely have a Sandy Bridge 2nd gen intel processor which dont support v2
“A notable change in this release is that the AMD/Intel 64-bit build now targets the v3 microarchitecture level.” CentOS Stream 10 Release Notes - The CentOS Project
AlmaLinux is building a v2 variant of centos 10 I can build Bluefin LTS images on v2 if there’s enough interest
Fedora still targets v2 too so you can use normal Bluefin