Overnight my Canon MP780 started showing a "wrong cartridge" message on the display. I only use OEM cartridges. One was low and I replaced it, with no effect. I've turned it on and off, no effect. The Canon website said to take out the print head, put it back in and realign it, no effect (couldn't realign as wrong cartridge message still shows.) The closest repair center is 145miles away on another island, so not an option. Any suggestions?