The 'Input Not Supported' message displays on the monitor before Windows even loads, there's not even a bios splash screen.

How do I fix my monitor Input Signal Out of range? To fix a monitor input signal out of range problem adjust the computer’s resolution to a compatible setting with the display.

Fix: NVIDIA custom resolution not supported by your display 2] Change the resolution on the Display/Monitor settings This follows if changing the resolution on your Windows 11/10 PC – you can ...