non root user cannot open applications

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Hello ,
I had peform login (to an x window  session ) as root.
I had added a user (let's call him nonRoot)  ,to a RH9 machine.
Now, I perform su  nonRoot.

When I try to open z application (or peform xhost +localhost) I get the following error:
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified


xhost: unable to open display ":0.0"

what should I do ?
regards,
sting

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