Why not recovering after starting systems updated?

I started Samsung systems updates then I went out of room and came to find screen black with cursor arrow present. Tried switching off and on but consistent black screen.

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

crwdns2934109:0crwdne2934109:0

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