07-04-2014 07:13 PM
Welcome to the HP Forums!
I understand your Officejet 6600 states no ink cartridge. I will do my best to assist you! I would recommend following this entire HP document on A 'Cartridge Problem,' 'Ink Cartridge Failure,' or 'Incompatible Ink Cartridges' Error Message Displ....
Are you using Genuine HP ink cartridges? Please post your results, as I will be looking forward to hearing from you. Have a great night!