I changed my broken screen and now when I try to turn on it lights up

I have a dell xps 18 and replaced broken screen and now when I try to power it it lights up and turns off! What is wrong?

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0