Will not print black ink. Cleaned print heads manually and with printer. Print heads will not align. I've changed cartridges. Before I began to have problems, I got the message "not a valid HP cartridge" but it was the same one I have been using for a while from Office Depot. All the other colors are working. I did go and by another black ink cartridge today. That did no good. I'm not sure what else to do. Need help.
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