Hi my name is ***** ***** I will be the expert working with you today to help and resolve the problem you have posted.
I am sorry to know that you are facing problem with your Canon MX880 printer.
Power on the printer must be on and then you open the cover and remove the ink cartridges check of any paper jam or any foreign object which might prevent the carriage head to move on the printer rail.
Close the cover and unplug the power cable leave it off for 3 to 5 mins.
do not insert the cartridges let me know what error you get on the screen.
not a problem if its printing well and good.