I have heard some things about HP and ink cartridges such as if you use a no name it would show out of ink but thought some of it was just myth, this will be interesting to follow:
http://www.msnbc.msn.com/id/7012754/
H-P sued over printer cartridge expiration
Woman claims programming, not ink level, determines life
http://www.msnbc.msn.com/id/7012754/
H-P sued over printer cartridge expiration
Woman claims programming, not ink level, determines life