I bought an ink cartridge from Wal-Mart that has no cyan ink in it, and I want a refund.

[rmgreen78]

See the thread title.  It's pretty simple.

[Bob_Headrick]

Genuine HP cartridges do have a warranty, see the document here for information. If the cartridge is genuine HP and  in warranty HP should replace the cartridge.  (For a refund you would need to contact your supplier.) To get warranty coverage you will need to go to the Contact HP page, then enter the information for your printer.  At this point it will likely say "Manufacturer's warranty has expired"  To the right of this it will say "See details".  Click the "See details" link, which will open another page with more details.  Near the bottom of the text will be a paragraph that says : 

HP has checked your product information, including the product and serial numbers, to determine your warranty results.The legal warranty expiration date is based on the date of purchase, as indicated on your receipt. If you feel these results are incorrect, you may submit a dispute for review. Dispute this > 

Click on the "Dispute this" link which will ask for some additional contact information.  Fill out the contact information, then in the bottom section select: 

Dispute reason  

  Issue with my Accessories, Supplies and/or Software. 

In the comment section indicate that you have a defective supply that is in warranty.