After replacing keyboard, screen doesn't turn on anymore.

Hi all,

Replaced my keyboard, now my mac does not boot anymore. When opening it, it flashes white for half a second, then the screen turns on. Fans are still running.


I think it means it does not pass POST check. What do?

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

crwdns2934109:0crwdne2934109:0

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