crwdns2893792:0crwdne2893792:0 mayer ,
crwdns2893800:0crwdne2893800:0:
Try starting up in Safe Mode by holding down the Shift key on startup. This will disable any extensions that may have been inadvertently installed. If it does start up and run OK, you know it is a software issue. Also try starting up in repair mode by holding down the R key and run Disk Utilities.
crwdns2892198:0crwdne2892198:0:
open