Why is my iPhone 5c not powering on without display and home button

I have just pulled a iphone 5c out of a old drawer and first, I attached the display loosely (not clipped in) and I got the phone to boot up. The touch was unresponsive but i thought that was because of the bad panel. After a few days just before ordering a replacement display, i tried the same test but it doesn’t register in finder on mac or make any noises while being plugged in to charge. This time i pulled the panell off and may have broken it in the removal process but only the panel and not any of the connectors. The only thing that i think may have caused this is that i was unscrewing and rescrewing screws because i wanted to take it apart (only superficially brackets) and in the process i lost some screws and maybe put the screws in the wrong holes. Does anyone reccomend me to buy another screen with home button and camera and try to restore the phone? does another home and camera even function on the 5C or will it get restricted by apple?