The first thing I thought of when I read your message, was whether or not your replacement cartridges were produced by HP or by another company. Also, was it a brand new cartridge or a refill? While buying ink cartridges from another vendor or "recycled" cartridges may save a buck or two, you can't always rely on the quality of the printouts they produce. If this is the case, try using an HP color ink cartridge and see if that produces better print quality.
If you are using HP ink cartridges, there might be an issue with the contact between the cartridge and carriage. It's an electrical connection and if the contacts get dirty, it can affect print quality...sometimes drastically.
Unfortunately, HP.com doesn't have a web page dedicated just to cleaning these contacts. Fortunately, they included those instructions in the following document:
Replacing the Print Cartridges
When the web page opens, scroll down to the bottom of the page and locate the task, "Fixing error messages that appear after changing a cartridge". This will contain instructions on how to clean those contacts. See if this helps.
If all else fails, try going to the following web page:
Correcting Print Quality Problems
This is sort of a "catch all" web page with a large collection of print quality diagnostic and repair techniques. If you've gotten this far wtihout a solution, perhaps something on this page will help.
Good luck.
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