Review on Smart Ink Compatible Ink Cartridge Replacement for HP 902XL 902 XL (2 Black, Combo Pack) – Compatible with OfficeJet Pro 6978 6968 6970 6975 6960 Officejet 6962 6958 6950 6954 6951 6956 6961 6963 6964 6966 by Jesse Jewett

He broke the printer. Just before we installed the new cartridge, the old cartridge was printing fine, only the ink was weak. We've made sure we've completed all the steps to install a new cartridge. We put in a new cartridge and after installing it printed blank pages. We then returned the old cartridge which used to print fine but is now printing blank pages. We also tried a second new cartridge but to no avail. We have tried many times to clean the printheads as suggested on the web with no success.