Cant reinstall macos with a broken screen

Hi everybody

so i wanted to reinstall mac os on my macbook pro, but since the screen is broken i have to use an external screen, but when i enter recovery mode my external display doesnt pick up the screen. Sometimes when i take it out and put it back in, it either goes grey or pink then it says no signal. Does anyone have any solution to this? I am not taking this to an apple store.