I had a very upset customer come into the store carrying his recently purchased Lexmark Prospect Pro205. He was  adamant  about returning the printer and didn't want to hear otherwise. I was able to  coerce  him into sharing with me his pain point: the printer kept telling him his ink wasn't installed. Well, he followed the instructions. All the ink was in the right place. What was going on? The instructions never told him to remove the seal!
On all new ink cartridges of every brand there will be a seal, usually orange, to make sure the ink stays fresh. If you don't remove it, the ink won't fit. It's up in the air whether the blame for the inability to install the ink correctly should be placed on Lexmark or the customer.