I think this system works for some HP printers, but definitely not for my (now thrown away) 2000C. Its "Number 10" ink tanks have a special chip whih can be resetted so that the cartridge stops working on ANY printer! Take a look at this fixyourownprinter article. It describes EXACTLY what happened to me... I freaked out just by remembering my own nightmares while I was reading it...tyamada said:I read on another forum, the way to beat the expiration date on the HP cartridges