How long was it since the printer last ran? ink has a habit of drying out on the head and blocking it up. You can get inkjet cleaning fluid and in conjunction with a lint free wipe, you can give the head a bit of a clean. if there is any crud blocking it should help a little.
it will never be the same again though so you may need to buy the head+cartridge combo to replace the damaged head if you are not satisfied with the output. At that point you might as well buy a new printer!!