Won't print PRIXMA iP1500\r\nGoing through the

If using aftermarket inks you sometimes have to rap them on a paper towel to break an air lock.If you see ink coming out after rapping them try to print again.If nothing comes out you may have a bad print head or purge pump.
Try cleaning the head (without cartridges)in a 10-20% ammonia warm water mixture for 30-45 min.
Completely dry the head before returning it to printer.