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You machine probably thinks it has more than one of the same colour installed. Take them all out and re-install one at a time allowing the machine to reset between each . If it doesn't fix the problem you will find out which cartridge is at fault and replace it.
? Seven flashes: Defective printhead
Remove and reinstall the printhead.
Also, ensure that the protective cap has been removed. If reinstalling the printhead does
not resolve the problem, replace it with a new one.
According to Canon 7 orange flashes indicates a print head fault. Solution they recommend is to take it to one of their service agents. Problem is that replacement print heads are not cheap and it is usually more economical to replace the printer. You could try taking the print head to a cartridge refiller and have it professionally cleaned (cost you nothing or next to nothing) and see if that solves the problem.
Jennifer, According to an answer by kev1952 on 19 Sept, to my similar error condition ( "repeating sequence of 7 orange and 1 longer green flash of power LED" ) in a Canon i550 printer, and assuming that what you called yellow I called orange, then you too may have a printhead fault. kev1952 recommended to try to get it cleaned and checked at an ink refilling specialist service.
gp26, on 21 Sept 2009
The user guide for that product says that 7 flashes means the printhead is defective and that you should contact Canon's customer care.
If you've recently replaced the print cartridge(s), try putting the old one(s) back in.
If the printhead is truly defective, there may be no choice but to contact Canon or replace the printer.