ahhh X and newbies dont mix

Ok, I did a big no no and accidentaly started X after I had done an su.
After quickly exiting KDE I exited my su and tried to startx using my normal
user account. It complained about my .Xauthority file and now I cannot run
X with that account. Root X still works though. Is this a common thing
that newbies like myself fubar? is there a quick fix? Thanks.

- Joel