SLES 11 SP1 X windows login screen disappear ..

Dear All

I have a problem (please look the attachment picture.)

My SLEL 11 SP1 use run-level 5, after I reboot the server.

the Ctrl+Alt F7 console only display the wallpaper...
(It should display a lprompt to ask username and password, please look the attachment picture.

and the login screen disappear...

I have no idea which log file I need to check.

But I have check the ":0-greeter.log", the output below:
# tail /var/log/gdm/:0-greeter.log
gdm[19175]: #39 0x00007fffec49ac38 in ?? ()
gdm[19175]: fo available.
gdm[19175]: #40 0x0000000000000000 in ?? ()
gdm[19175]: No symbol table info available.
gdm[19175]: A debugging session is active.
gdm[19175]:
gdm[19175]: Inferior 1 [process 19170] will be detached.
gdm[19175]:
gdm[19175]: Quit anyway? (y or n) [answered Y; input not from terminal]
gdm[19175]: ******************* END **********************************

Cant any one advice , how to troubleshooting this problem...

Any advice is welcome. Thanks.

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