Product is HP photosmart c309a printer. Not printing black. I was getting a message on the printer screen that said the cable linking printer and iMac was invalid. First time for this message in 3.5 years of use. Then the print output was missing color, and I had "low ink" message. I replaced all cartridges with fresh ones. Still not printing black. Cleaned the heads. Still have problem. Tested by printing a page with photo and text. Appears to be failing to print black -- photo is off-color and no text appears. Tested again by printing an email I received. Interesting result. Output has printed the email headers "From", "Subject", Date" and "To", but none of the content (including the names, etc, in From, Subj, etc) of the email. Need help.
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