5.Reinsert the print cartridge by sliding it forward into the slot on the right. Then push the print cartridge forward until it clicks into the socket.

Solve a problem

6. Repeat steps 1 and 2 for the tri-color print cartridge on the left side.

NOTE: If the print cartridges are installed in the wrong slots and you cannot remove them from the product, contact HP support for service.

Go to: www.hp.com/support.

If prompted, choose your country/region, and then click Contact HP for information on calling for technical support.

Cause: The indicated print cartridges were installed incorrectly.

Print cartridge problem

The message might indicate which cartridge is causing the problem. If the message does not indicate which cartridge is causing the problem, follow these steps to determine which cartridge is the problem cartridge. After you determine which cartridge is the problem cartridge, continue with the first solution.

To determine which print cartridge is having the problem

1.Make sure the product is on.

2.Open the print cartridge door.

The print carriage moves to the center of the product.

3.Check to make sure you are using the correct print cartridges for your product. For a list of compatible print cartridges, see the printed documentation that came with the product.

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HP 4400 - K4 manual Print cartridge problem, To determine which print cartridge is having the problem