SOURCE: HP deskjet 3420 won't print in black.
It's probably because the colour cartridge has run out, it needs a colour cartridge aswell to print black.
SOURCE: A Deskjet 990 that only prints in pink and black.
If you've already gone through all the HP recommended troubleshooting steps for this, at
http://h10025.www1.hp.com/ewfrf/wc/document?docname=bpa00224&tmp_task=solveCategory&lc=en&dlc=en&cc=us&product=61237, then I would highly recommend the unconventional (and unsupported by HP) method that has worked for numerous people having the symptoms you describe with multiple model families of HP deskjet printers:
http://www.fixyourownprinter.com/forums/inkjet/13694#20
If you read through some of that thread, you'll see that it seems to work for most people. Some people had to go through those steps several times before color was printing again.
Good luck!
david
SOURCE: Windows 7 installs default drivers for HP DeskJet
overload the driver which has came from ur printer
SOURCE: I have a HP DeskJet 842 C. I have a black
The nozzles of the color cartridge is blocked or u have set the photo print to gray print
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