cannot print w/hp842c

[Moses Backman III]

i have been able to use the hp550 driver with redhat 6.2, mandrake 7.1, 
and open linux 2.4, but i can't get potato to print.  i'm sure there's a 
config tool i'm missing or not aware of.  i did compile with serial 
parport support.  in my kernel log, i the printer shows up as hp 840 
(which is right) but i still can't print.  
HHHHEEEEEELLLLLLPPPPPPP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!