hello i recently bought a N900 from the carphone warehouse, however my charger is dodgy, i tried the adapter thing from an older nokia, it says it's charging but when i take it off the charger, the battery hadn't rose at all. the charger i had in the actual box, everytime i plug it in it says i have plugged my headphones in?! please help, is it a major issue or will it just pass???

please comment.