Can cartridge lying empty , be refilled ?
It depends on circumstances, in which cartridge was kept. If cartridge is kept in warm place, the ink inside the cartridge may dry out. Once the ink dries in print head, it becomes difficult to open it. So best thing is to make sure heads do not dry. If you take out cartridge, use a piece of sellotape to cover print head and keep cartridge in plastic bag to help prevent it drying out.