Problem with xwindows

[Rajesh Pandey <rpandey@xxxxxxxxxxxxxx>]

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I am having a problem with Xwindows. The Xserver is started by the root
and if do change user and and start an application I get the following
error message:

Can't connect to X11 window server using ':0.0' as the value of the
DISPLAY variable.

How do I get it working?

Thanks in advance.

Rajesh

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Content-Description: Card for Rajesh  Pandey
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begin:vcard 
n:Pandey;Rajesh
tel;fax:+91 40 789 8442
tel;work:+91 40 784 5252 
x-mozilla-html:FALSE
org:MVP Systems Limited.
adr:;;Plot No. 2, Sai Nagar, Picket;Secunderabad;Andhra Pradesh;500 009;India
version:2.1
email;internet:rpandey@xxxxxxxxxxxxxx
title:Regional Manager
fn:Rajesh Pandey
end:vcard

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