I have two Lexmark Z54 InkJet printers attached to two different computers...bothe computers are running Windows 98SE. One of the printers is less than a month old. The other less than a year. Both printers have new cartridges installed. Almost at the exact same time both printers stopped printing color. Both will print black perfectly...I have tried cleaning the heads and realigning the cartridges but still only get black. Can anyone shed any light on this problem?