Thank you both for your replies.
I tried the eraser a couple of times but it did not solve the problem, it still says wrong cartridge. I am going to miss this printer, especially since I still have a ton of cartridges for her. The canon I had before her took the same tanks which led me to buy...
to replace my mp780 that I just loved.
The MP780 however gives me the message "wrong cartridge" and I have tried cleaning the printhead but it did not work. A new print head is over $50 on ebay and that still might not clear up the problem from what I have read, so just bought the mx850 because...