I have had this printer (canon pixma mp150) for quite some time but have now only just refilled the inks. Reinstalling new cartridges all went smoothly and went to print a test page, I just made a test page in illustrator as I don't know how to do it on a mac, anyway black and yellow seem to be printing fine however cyan and magenta don't seem to be printing. Via the printer I have cleaned the cartridges and I have no idea how to fix this, please someone assist me.