What type of HP device are you trying to set up? Is it connected to a parallel port or a USB port? If it's connected to a parallel port, is the "parallel" service activated for your computer? Also, is CUPS (aka Common Unix Printing System) selected to be one of the services that loads at boot time? CUPS and HPLIP work together, in that HPLIP provides the driver for your device to CUPS, which in turn does the dirty work of communicating with your printer.
A quick and easy way to see whether the CUPS service is loaded is to open a terminal and type "htop" (without the quotes) at the prompt. Htop lists the processes that are running. If you see /usr/sbin/cupsd, then the CUPS service is running. If the CUPS service is not running, then you'll need to activate it. To do this, click on the Start button and select vasm -> SUPER (type the root account password when prompted) -> SERVICE -> SRVSET -> 2, 3, 4, 5. Ensure that CUPS is selected. If it isn't, then click on the check box next to the word "CUPS" to select it for each run level you might use.
If you need to activate a parallel port, use vasm -> SUPER (type the root account password when prompted) -> SERVICE -> HWSET -> parallel.
HTH some. Post again if you need more help.