Canon Pixma MP220 wont scan, any help? (Details inside)

My girlfriend has a Canon Pixma MP220 printer and scanner. It believes itself to be out of ink (it isn’t), but that isn’t the big problem, we could really do with it scanning, but it wont allow that because it believes itself to have no ink.

Does anyone know of a work-around that might help? Or just have any clever ideas as to what I should do?

All help appreciated!