Innovera Compatible Cyan Toner Cartridge (Alternative for HP 641A/C9721A/Canon EItem has been installed in a printer, Printer did its cycle and rejected cartridge. Whether it was the printer or cartridge its self that was not diagnosed. Company has since liquidated all there office equipment and cant be retested. Once again toner is all there but toner may or may not work. For printers that may reject the cartirdge there should be a sequnce of buttons you can push to manaually tell the printer you installed new toner cartridge. and then it should work perfectly fine Sold Quantity1Cartridge ColorCyanReplacement BrandHPReplacement ModelC9721A (HP 641A)Compatible ProductsHP Color LaserJet 4600, 4600N, 4600DN, 4600DTN, 4600HDN, 4610N, 4650N, 4650DN, 4650DTN, 4650HDN (HP 641A)Cross Compatible with Canon ImageCLASS C2500, LBP-2510 (EP-85)Approximate Page Yield9000 PagesCoverage6%TypeCompatible