Phillip Cheng , May 21, 2008; 01:50 p.m.
Try cleaning the printheads by removing them, and swabbing them with rubbing alcohol (witha lint free cloth, the fibers can clog the ports)
If that still doesn't work then you probably have bubbles in the print heads, in which you need to submerge just the heads into hot water (or alternatively water and soap if you're fancy).
You can find detailed instructions on the net through google. But its a fairly simple proccess.
If your printer has seperate print heads make sure you are cleaning the printhead only (it looks like a fancy circuit diagram). Don't try cleaning the tanks. If you refill, make sure you don't get bubbles the next time you refill.