Canon printer model BJC-4300, print head cartridge assy always returns to center and power light flashes green, a couple of times when turned off then on it would return to center, beep three times and flash green/amber till turned off again. Customer indicated he had replaced the color ink cartridge but not the black. Does anyone know what this printer is trying to tell me? TIA Jim Myers jr.myers@xxxxxxxxxxx Help make your TechAssist online repair tips database better! Submit your fixes here: http://www.circuitwork.com/techassist/tip/#tips To unsubscribe write to: techassist-request@xxxxxxxxxxxxx with unsubscribe in the subject line.