No output when booting into the installer media

[nepti]

@The-Malicious-Fpx

I select it from the boot menu and I get a single flash of the underscore cursor, then nothing, just black.

Do you mean the BIOS boot menu or GRUB menu?
BIOS settings correct? Secure Boot off, Fastboot off, AHCI on?
Have you tried this:

@SGS

Use ventoy, than use grub2, not normal boot. For me the keybord settings to german did not work so check for wifi connection if you use the correct password it use us keyboard layout.

?