I dont get a login screen

when I try to startup the xserver in normal mode iget a message “Invalid MIT-MAGIC-COOKIE-1 giving up.
xinit: Resource temporaily unavailable (errno 11): unable to connect to X server
xinit: No such process (errno 3): Server error.”

I dont know what this means except that something does not work.

Have a look here
Invalid MIT-MAGIC-COOKIE-1 - Google Search