Unable to open display or run xterm

[Glen Robinson]

Christopher Faylor suggested that I try:
DISPLAY=:0 xterm&
This immediately failed with error 53 (after hitting return twice).  The 
exact same thing occurred in attempting to run xclock (DISPLAY=:0 
xclock&).  I am not sure what error 53 is  (or where it is coming from  
- xterm or the shell  - or). When I close windows (right click on X in 
tray then exit button) I get a message that zero clients are running.  I 
am currently trying this on my HP desktop which has a geForce 7600 
display adapter (i.e., 2 monitor capable adapter).  The X display does 
come up and I can move the cursor with the mouse, so I presume X is 
hitting the correct spigot. 

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