I have a PIXMA MX922 all in one printer that displayss a support code of C000. A few months back it would print blank pages only.

SOURCE: Cannot see ink levels

Inkjet printers do not detect ink levels period. An estimate of level is made by the software. It calculates the volume of ink that was dispensed during printing pixel by pixel. If you re-install the software the tally is lost. If you want to convince the software that the cartridges are full then go though the procedure of renewing the cartriges but put the old ones back in. If I were you, I'd completely ignore the displayed levels of ink, its worthless technocrap. Your eyes are the best judge of whether the cartridges need replacing or not when you look at your prints.

SOURCE: kodak 5100 will not print consistently

I am currently having the same problem with a 17" iMac Intel Core Duo.  The printer worked fine for a few months, now it will only print in black and white and sometimes in color that is extremely faded.  I have tried every troubleshooting tip in the book and still no luck.

SOURCE: printing blank pages

I am working on the same problem. While you will not like the
answer here it is for the canon mf6530. What is causing it
is the shutter over the laser is failing to open. There for
it blocks all exposer. A temperary fix is to carefully lift the
shutter and tape it open using black electrical tape. Then
try a few prints you should have an image if this is your
issue as it is mine. I do not recommending running it in
this condition very long. When I find the final answer I
will attempt to post it.

SOURCE: black ink cartridge is leaking and black line is running down back of page

YOU CAN TRY PULLING THE CARTRIDGE OUT AND WITH A CLEAN , VERY SOFT CLOTH , CLEAN THE HEAD GENTLY ....SOME CARTRIDGES ARE JUST FAULTY ....HAVE YOU TRIED RETURNING IT OR GOING TO CANON SITE AND TROUBLESHOOTING ?

SOURCE: Printer does not print using black ink

Check your settings i=under the Services Toolbox. Also go into printer preferences and see if you can force it to print in black only.