Hi costante,
You might try doing an Ink System Reset. To do this, remove the ink cartridges. See this link. Close the carriage access cover. Follow the Hard Reset instructions in the following link. Click Here Once the printer powers back up and indicates that one or more of the ink cartridges are missing, re-seat one of them and close the access door until the cartridge registers. Repeat the process until all cartridges are reseated. Did this help?