On Tue, 14 Dec 2010 21:21:41 +0800, Qijiang Fan wrote: > After choosing the user and entering the password,i clicked "Enter" > key.And gdm restarts automatically without notice. debian sid (...) Try to reach a tty, fall into runlevel 2, restart GDM3 service (run "/etc/ init.d/gdm3 restart") and see what happens. It's like your Xorg server is crashing when you login :-? Greetings, -- Camaleón