No feedback from aticonfig

[Job Evers]

I'm trying to get dual monitors working on my new Dell Inspiron 530 with 
   an ATI Radeon HD 2400 PRO card. Out of the box the two monitors run 
as cloned display.

Directions online indicate I should be able to use aticonfig to 
accomplish this, but any options I run seems to have no effect (and I'm 
having a hard time finding any sort of documentation on what the command 
does).

Is my aticonfig broken?

Thanks,

-Job