Q[Switch] The display has turned grey / unusual colours. Why is this?
It's possible that the "Change Display Colours" setting has been altered to "Greyscale" or "Invert Colours".
You can check this via "System Settings" → "System" in the HOME Menu.
* The "Change Display Colours" setting is only present on system version 3.0.0 or higher.
* Changes to the display colour via this setting have no effect on screenshots taken using the Capture Button.