Are you using HP cartridges, compatibles, or remanufactured ones?  If you bought a new HP 23 you paid about 60% of the cost of a new inkjet printer by epson, lexmark, or HP.  The 722C is very old, and it would not be worth spending anything to fix it.

>Hi all,
>
>I have developed a printing problem that maybe someone can shed some light
>on.
>
>I have an HP DeskJet 722c which has worked well for years. It runs under
>WinXP Pro. This is a printer that has two ink cartridges - one is black only
>(HP45) and the other is a tri-color cartridge (HP23). A few days ago, I
>started to get faulty colors so I bought and installed a new color
>cartridge. The new cartridge will NOT print yellow, and therefore will not
>print colors that depend on a yellow component. If I print a test page, I
>get a total blank area wherever the yellow should be, and as a result some
>other colors are not right either.
>
>I would suspect a faulty cartridge, except for the fact that another
>phenomenon is happening at the same time. I can't get BLACK only text
>printouts unless I go into "normal" (not draft) print mode. If I print a
>text document in draft mode (my usual), the color is purple, not black. If I
>switch to "normal" mode, the print color is black. So I know that the black
>cartridge is not dry since it CAN print black, it just refuses to do so in
>draft mode, no matter what I do. Since I print a lot in draft mode, I don't
>want to use the extra black ink in normal mode, but then again I don't want
>to deplete the color cartridge prematurely either (since I assume that is
>the only place the purple print can be coming from?)
>
>Here's what I have tried so far:
>
>* Uninstall and re-install the printer several times (no avail)
>* Search for an updated driver (there is none)
>* Clean the contacts on both cartridges (no avail)
>* Clean the printer's internal contacts (no avail)
>
>At this moment, it strikes me odd that two (seemingly independent?) "color"
>problems would beset me coincidentally at the same time. Could this be
>something gone awry in the printer's internal electronics? Is there
>something else, short of buying a new printer, that I can try?
>
>

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