Feb 09, 2008
-   Same exact problem - have replaced ink cartridges, and cleaned and deep cleaned repeatedly. Absolutely no black output.
I noticed the silver-colored circular dot on the printhead looks different on the black slot than on the slots for the '6' black, and colors. The other slots all have a spongy looking dot, while the silver-colored circle under the large, 3e Black cartridge looks more solid, less like a sponge, and more like a circular piece of foil.
For whatever it's worth, I've also removed the cartridges and print head, and swabbed the various spots that ink traverses with rubbing alcohol and q-tips. Nothing changed, aside from my inking up a bunch of qtips.
I wonder whether or not that's normal?
The printer was recently given to me due to a different problem that I've fixed. (Always asked the user to press Resume, and still would never print after the Resume button was pressed.) For most of it's life it was fed 'XPrint' brand ink cartridges, not Canon-brand. I don't know if that's relevant to the problem.
-- Steve-  
NoahsMyBro