remote desktop

Hi

i read the manual here: http://goo.gl/iAlIoA

but when i type xeyes but i get

Error: Can't open display:

is blank at the end of the line

i already use ssh with -X argument to login to my server

and i cant run vncserver or teamviewer server on it,too

it shows

Fatal server error:
no screens found

Please consult the The X.Org Foundation support 
         at http://wiki.x.org
 for help. 
Please also check the log file at "/var/log/Xorg.1.log" for additional information.

Server terminated with error (1). Closing log file.
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error
Window manager warning: Fatal IO error 4 (Interrupted system call) on display ':0'.

always can't cant run X-window ,

is there anything i do wrong or how can i solve it

thank you very much :D