Question about Canon PIXMA MP780 All-In-One InkJet Printer

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Printer won't work

I have a Canon Pixma MP 780 printer that won't print or copy... Error message #6400. I've tried to clear it, but the alarm light keeps flashing - no response. Opened it up and checked for jams, etc. Can you help? Thanks.

Posted by Gary Meyer on

  • 1 more comment 
  • Anonymous Nov 29, 2007

    My Canon PIXMA MP 780 is having problem, I cant print, copy of fax.. It always say load paper but but I already load paper.. Can you help me..

  • ewalker Dec 02, 2007

    I loaded new ink cartridges printed one page and alarm light started flashing i have removed and reloaded shut off both pc and printer and no response

  • b_wood Feb 06, 2009

    on pc it readsthe red light flashing and ##357 appears which have notbeen able to clear



3 Answers

Geraldine Watts

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Flashing led lights indicate the printer is malfunctioning so we can mostly rule out pc issues. Does the carriage for cartridges roll to left as if ready to install cartridge when you open up the unit. Try this. If it wont it is most likely jammed in avery small way. My own printer did this. It turned out my little 2 yr old decided to play post the tiny piece of cardboard, and after diagnosing for 2 hours, error messages and all i found the tiniest jammed carboard piece with a set of tweezers right in the end near the cartrigde carriage, between the teeth of the paper roller and the carriage. You could get lucky and have the same issue. Also make sure all print jobs are cancelled, and check is drivers and device is actually functioning ok, go to control panel, performance and maintenance, system, hardware, devices, scroll down to your printer, and make sure no yellow exclamation marks appear.

Posted on Aug 10, 2007



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You should try it with a high speed usb interface .if you have already a high speed usb interface then you should insatall teh driver of usb first. Other ways you need to reinstall the printer again . or you can try with change the cartriedge .

Posted on Mar 10, 2007



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Can you check the error code please?

Posted on May 20, 2007

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