I am receiving an error "only one set of ink ready cartridges etc..." I have read a number of posts (given, not all) sand they seem to reference simple trouble shooting or using the trial cartridges. So, I have four of the 6978 printers. One of them simply stopped printing black - I replaced it until I had time to trouble shoot - it has been setting unplugged for a couple of months. I took the cartridges out of the unit so there would be no gravity drain on the ink. Today I finally re-installed the cartridges, plugged in the unit and it cycled with the ink error. These are NOT trial cartridges. I then took cartridges out of a perfectly functioning unit and received the same message - re-installed both sets of cartridges in another 6978 and they work fine. To the best of my knowledge I have never signed up for instant ink on any of the four printers (never been billed and it isn't listed under my subscriptions) - I'd really like to get this unit working as a back up.
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