connection to ":0.0" refused by server
 

Okay I've read everything that seemed relavent on google about this so here it goes. As anyone but the user I always log in as X starts up just fine but if I try to start up X as a different user I keep getting "connection to ":0.0" refused by server" whenever I try to open a window.

which distro ?
which user name ?
ls -la /home ?

Thanks,