I get a U163 error message, saying I have run out of black ink, but I just replaced the ink cartridge. No what do I do?
quoting http://fix-your-printer.blogspot.pt/2009/06/error-u163-on-canon-printers-mx-series.html after a google search :
"Press and hold the 'Reset' button down for 5 seconds."
hope it helps.