I have the officejet pro 8600 printer. It worked fine for seven years but stopped working in december last year. The problem happened when it was out of black ink and asked if it was to continue with other types of ink, i.e the colored ones. I answered YES and then it stopped working. Error message said that there was a problem with the printer head (missing or faulty or similar as I remeber it). I carried out the suggested procedures several times but to no avail. This included taking out the head and putting it back. I also cleaned the electrical contacts of the head, but it did not help.
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