(From: Fred Keen (email@example.com).)
|Printer and Photocopier Troubleshooting and Repair Collection : Cartridge detection on HP DeskJets
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The HP printers test for the presence of a cartridge by checking the
electrical voltages on the contacts between the cartridge and the cable.
The slightest amount of dirt on the contacts can give a false reading
making the printer think that no cartridge is present. If cleaning the
contacts does not work you will have to buy a new cartridge.