[NTLUG:Discuss] vnc or x server problem?

[m m]

We just have 2 linux servers host in the Planet.com
Server boxes are RHE 5. booted on runlevel 3 mode.
 
Their don't install vnc server for us and I have to do it by myself.
I have vnc installed.
 
 
1. start vncserver:
#service vncserver start
 
Starting VNC server: 2:root xauth: (stdin):1:  bad display name "PDP-PLANET123:2" in "add" command
New 'PDP-PLANET123:2 (root)' desktop is PDP-PLANET123:2
Starting applications specified in /root/.vnc/xstartupLog file is /root/.vnc/PDP-PLANET123:2.log
                                                           [  OK  ]2. tried vncviewer:
# vncviewer 127.0.0.1:2
 
VNC Viewer Free Edition 4.1.2 for X - built Jan 15 2007 10:33:32Copyright (C) 2002-2005 RealVNC Ltd.See http://www.realvnc.com for information on VNC.vncviewer: unable to open display ""
 
I have the same vncserver setting on the in-house linux box and it works. so I believe, something wrong on the host boxes. 
 
I did: 
which xdm
 
I can not see the xdm
 
I wonder I don't have X server installed or not running. Am I wring?
if so, how do I check if the X server is installed and running?
 
Please help, Thanks.
 
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