I have done all the HP.com stuff, tried two different cartridges,
reinstalled the latest drivers and tweaked the software. What else
can I check or do to make my HP DeskJet 840C print yellow? The other
two primary colors are fine. Thanks.

Buy a new cartridge. If you are sure that the other cartridges are not empty
you could try blotting the print head on a wad of warm damp paper towels.
http://www.alotofthings.com/supportf...rimerpages.htm

"jm" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> I have done all the HP.com stuff, tried two different cartridges,
> reinstalled the latest drivers and tweaked the software. What else
> can I check or do to make my HP DeskJet 840C print yellow? The other
> two primary colors are fine. Thanks.

"tomcas" <(E-Mail Removed)> wrote in message news:<Dodtb.14625$(E-Mail Removed)>...
> Buy a new cartridge. If you are sure that the other cartridges are not empty
> you could try blotting the print head on a wad of warm damp paper towels.
> http://www.alotofthings.com/supportf...rimerpages.htm
>
> "jm" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
> > I have done all the HP.com stuff, tried two different cartridges,
> > reinstalled the latest drivers and tweaked the software. What else
> > can I check or do to make my HP DeskJet 840C print yellow? The other
> > two primary colors are fine. Thanks.

They were both brand new cartridges.

"jm" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> > "jm" <(E-Mail Removed)> wrote in message
> > news:(E-Mail Removed)...
> > > I have done all the HP.com stuff, tried two different cartridges,
> > > reinstalled the latest drivers and tweaked the software. What else
> > > can I check or do to make my HP DeskJet 840C print yellow? The other
> > > two primary colors are fine. Thanks.
>
> They were both brand new cartridges.

Check the "install by" date on the cartridges. I would expect that the
cartridges are out of date, as storing cartridges for long periods of time may
cause this problem. Check the warranty date as shown at the following:
http://www.hp.com/cposupport/printer.../bpa02014.html If the
cartridges are still under warranty return them to your dealer or HP for a
replacement. If the cartridges are beyond the two year warranty get a new
cartridge. When purchasing new cartridges I would look for an "install by"
date at least six months in the future.

Regards,
Bob Headrick, not speaking for my employer HP