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

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 ...

If you find that AMD FreeSync is not supported or working on your Windows 11/10, here are suggestions to help you get around the problem.