Black print is not on AIO 7280

My wife and I are that both connected to 7280 which we have had for about 2 years and working well until yesterday when black stopped printing. I tried to install a new print cartridge, tried to clean the heads and tried printing alignment with the result that it says alignment failed. I have tried cleaning the contacts with the swab.   I do not know (or understand) how to have access to the print heads and if thaey are thye or printer cartridges. I read everything I can find already on the topic in the forum. All prints and works OK except the black printing. Can you help me please?

This problem was solved later help of? Which computer Help Desk.  They directed me to clean the print heads using the Toolbox for the C7280 on my computer. Previously, I had used the Toolbox on the screen of the printer itself that has been without success. When I used the command "clean printhead" from my computer, the first attempt was also unsuccessful, but he then gave me the opportunity to own intermediate printhead if the initial cleanup will not produce a satisfactory result. I guess the intermediate clean print head is a deep cleaning. When I did the pure Intermedaite test page (which automatically printed) printed in BLACK, but also all of the colors. Eureka! HP would not help me because I'm out of warranty, but I am so grateful to? That because I'm almost about to buy another printer.

Tags: HP Printers

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