Question about HP DeskJet 940c InkJet Printer

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HP deskjet 940 c

My printer stopped working as soon as I inserted a new cartridge. I did make sure that it was the right one for the machine - hp 15 black.Now what happens is that the first of the three lights is blinking amber and the third light is a steady green. When I give a printer command nothing happens except that the printer section of the control panel tells me that the document is being printed.

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