To fix monitor input on your Windows 11/10 computer, do the following: Under the monitor name that is having the Input Not Supported error, click Display adapter properties for 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 ...

Verify Monitor Input Source Sometimes, the monitor might switch to a different input source after waking up from sleep.