I am trying to install elementary OS 5.1, but I can never go into live boot on my Razer Blade Pro 17 4k 120hz laptop. The screen just goes black and shows some tearing. I tried doing
nomodeset but still nothing works.
Normally the nomodeset trick works 99.999% of the time. Can you confirm you tried this way?
Also, when booting from the USB media, please try both UEFI and BIOS with and w/o 'nomodeset' to see if there are different behaviors.