You mean, Chess.com or your screen?
my screen doesn't display properly

I assume you restarted your computer at least once. If yes, check if there any loose cables poorly attached on the back. If no, get another screen and see if the problem persist. If the problem persist you need to give your computer for repairs. If it goes away - your screen is very likely terminally ill.
my screen blinks a lot for the past 2 days, my background won't show up, and i can't access chat. What should i do?