And on linux you can always boot a live usb and mount your file system to it and try to figure out whats wrong. I had to do that only a few days ago to repair t

And on linux you can always boot a live usb and mount your file system to it and try to figure out whats wrong. I had to do that only a few days ago to repair the bootloader that had fried itself somehow. Of course you have to know what to look for, maybe this is possible with windows and macos too, but the way I always went with those was to do a fresh install.