First thing to do
===>First take off the Cartridges & clean them with a soft cotton cloth & put them back in.(read the printer manual to do it safely).
::: Did you get any Diagnostic software with the Printer?
Coz if you have, then you'll have the "HP Director", in it slecet the model (if u have 2 printer or fax..) then "settings ->Print Settings->Printer Toolbox.
In this Printer ToolBox, your HP Diagnostic Software can Re-Align the Cartrideges (if needed), Print TEST PAGES & also give an graphical estimate on the Cartridges "INK LEVEL"
go here . HP site ( your Printer model Troubleshoot page)
http://h10025.www1.hp.com/ewfrf/wc/p...&lang=en&cc=in