AIX

When we as normal user try to login, the session startup terminates and we are presented with the login screen.The root user is able to login without any problem.I can log in to the Aix server as normal user through telnet & using xmanager but not directly through server terminal .The Aix version is 5.3.The servers are IBM P 520 & p505.
I require help can somebody help me out & thanks in advance.

The contents of /home/user1/.dt/startlog file
is given below.


--- /usr/dt/bin/Xsession starting...
--- Xsession started by dtlogin
--- sourcing /home/vinod/.dtprofile...
--- sourcing /usr/dt/config/Xsession.d/0010.dtpaths...
--- sourcing /usr/dt/config/Xsession.d/0030.dttmpdir...
--- sourcing /usr/dt/config/Xsession.d/0040.xmbind...
--- sourcing /usr/dt/config/Xsession.d/0050.dtxmodmap...
1356-203 xmodmap: Unable to open display: :0.
--- starting /usr/dt/bin/dthello &
--- starting /usr/dt/bin/dtsearchpath
/usr/dt/bin/dthello: can't open display
--- starting /usr/dt/bin/dtappgather &
--- Tooltalk Message Server did not start within timeout specified.
--- Launching Xfailsafe_tooltalk_error to correct problems.
1356-265 /usr/bin/X11/xsetroot: Unable to open display: :0.
mwm: 2053-015 Could not open display.
1356-203 xmodmap: Unable to open display: :0.
Error: Can't open display: :0
Error: Couldn't find per display information
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"startlog" 20 lines, 914 characters