ssh로 접속 후 skartkde가 안됩니다...

ssh로 접속 후 skartkde가 안됩니다...
집의 centos 5.2 x86에서 사무실의 centos 5.2 x86로 ssh로 접속 후 skartkde가 안됩니다...

[root:localhost:~]# startkde
xsetroot: unable to open display ''
xset: unable to open display ""
xset: unable to open display ""
xsetroot: unable to open display ''
startkde: Starting up...
ksplash: cannot connect to X server
kdeinit: Aborting. $DISPLAY is not set.
Warning: connect() failed: : No such file or directory
ksmserver: cannot connect to X server
ERROR: Couldn't attach to DCOP server!
startkde: Shutting down...
Warning: connect() failed: : No such file or directory
Error: Can't contact kdeinit!
startkde: Running shutdown scripts...
startkde: Done.

뭐가 문제인가요?