ASUS Pavillion Q501LA Looping when trying to start

Looping and restarting. Cannot get to login screen. What is the function key you can use to run diagnostics?

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

crwdns2934109:0crwdne2934109:0

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