An electrophotographic image forming device according to one embodiment includes a controller configured to provide a page countdown for a replaceable toner cartridge of the image forming device on a display screen. The controller, upon detecting an installation of an imaging unit previously mated with a first toner cartridge that was out of usable toner and detecting a presence of a second toner cartridge, is configured to determine whether the second toner cartridge is out of usable toner. The controller is configured to determine a number of pages remaining for a page countdown associated with the life of the second toner cartridge and whether the toner sump of the imaging unit contains sufficient toner to print the number of pages remaining for the page countdown associated with the life of the second toner cartridge if the second toner cartridge is out of usable toner.