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Question: Epson Stylus CX7400 will not print!!! Help me please!

I bought new printer ink cartridges but it only accepts one (yellow) out of all the colors. It shows that the cartridges are there but won't accept them as being there. Plenty of ink in them as they are brand new....and no they weren't purchase directly from Epson! Printer prints great but need it to work for me...!!