HP Photosmart C6340 All-in-One Printer - Manual (Page 286)

c. Wipe the area dry with a dry lint-free cloth before proceeding to the next step.
8. Make sure the latch handle is raised, and then reinsert the printhead.
9. Carefully lower the latch handle.
NOTE: Make sure you lower the latch handle before reinserting the ink
cartridges. Leaving the latch handle raised can result in incorrectly seated ink
cartridges and problems printing. The latch must remain down in order to
correctly install the ink cartridges.
10. Using the colored shaped icons for help, slide the ink cartridge into the empty slot
until it clicks into place and is seated firmly in the slot.
11. Close the ink cartridge door.
Cause: The printhead or ink cartridges were not installed correctly.
If this did not solve the issue, try the next solution.
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