Printing Errors or Lights & Stuck Print Jobs

This issue has been posted before, but I haven't seen a solution that works. I recently replaced the cyan cartridge. Now:

Cyan comes out cyan,

Magenta comes out violet,

Yellow comes out a greenish-teal color.

 For some reason, it seems cyan ink is added to everything, in abundance. All images come out varying shades of blue.

 I've run all the diagnostics, head cleaning, etc. None seem to deal with a wayward ink cartridge.

 Is the cyan cartridge the problem, and buying a new one will correct it, or is it a crap shoot?

In my case:

• Only genuine hp cartrdges have been used, purchased from a high-vol retailer.
• I use the printer every day for documents; colours were good until after I changed the cyan cartridge a few days ago.
• Cleaning and alignment rituals did not help.
• Yellow is still at 40%, magenta at 80%, black at 90%.
• On the Print Quality Diagnostic Page, I get yellow in Test Pattern 2 (3 densities of yellow, but with a bit of cyan across the top of the yellow block).

Edit - Cyan is also showing on black-and-white prints - some grey areas are coming  out in different intensities of cyan. These are uniform over the grey areas, not streaked like the yellow areas described above.