Is there a Screen switch?

Recently started having problems with the screen turning on/off intermittently. Opening the screen sometimes it goes blank, fades or screen is all grey. Noticed that if I grab the right corner near the hinge and squeeze upper and lower halves together it comes on. Also noticed the screw at that corner holding the halves together is stripped. Is there a switch in there that activates the screen when opened. I cannot remove the stripped screw. It is stripped in place and will not come out. Any help would be appreciated. Thank you.