Most frequent cause is insufficient cleaning before storage; dried ink — especially black — can block the feed. A thorough cleaning with lukewarm water solves the problem in many cases. With a roughly six-year-old Bohème from an official specialist retailer, a counterfeit is very unlikely, since counterfeiters only after market establishment dare copies of new models. If the writing instrument despite cleaning remains dry, it should be presented to a dealer or to the manufacturer for assessment.