I can't reboot phone

I have lost network connection and do not have a restart option on menu. When I try to hard reboot it only flashes the Samsung word but doesn't vibrate.

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

crwdns2934109:0crwdne2934109:0

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