Epson replacement cartridge on Epson Stylus cx8400

Epson Stylus cx8400
insert new Epson replacement cartridge and wait until the printer refused to recognise it.
The solution was to push down on the cartridge an additional 1/4 inch so that until it clicked in place.
Try pressing down on the level replacement cartridge 1/4" until it clicks - this may even work for non-Epson cartridges as well.

good luck