Question about Canon PIXMA MP780 All-In-One InkJet Printer
Sounds like your black ink cartridge is not working. 1) Take it out and put it back in all the way so the cartridge is seated and makes proper connection. 2) The black ink may be malfunctioning and needs to be replaced. It may still have ink in it but the electrical connections are not working. Hope this helps you.
Posted on Nov 21, 2008
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Posted on Jan 02, 2017
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