Ender 3 V2 Screen problem

[AsianGuy]

When you say grey...do you mean the dull grey during a firmware upload?

Did you have a micro sd in your printer with a .bin file on it? If you have a .bin file with the same name as the firmware currently uploaded, the system stalls out

Along the line of what robert_clif said, you should connect your printer to a computer via something like pronterface to see if it can take in commands, then you can figure out if it's your display or the board that's an issue

If it IS your display, flash that with new firmware (UI has their own firmware) before buying a new one as a last ditch effort to save it.