I've been having the same problem since late June......have ordered LOTS of new ink and still nothing works. It works every now & then but only faintly. the other colors seem to work fine. Just not the BLACK cartridges, and I've changed 4 times. Today I tried updating drivers, and the "Print & Scan Doctor" program keeps indicating there is a conflict with the drivers, asking me to uninstall and reinstall. Did that, and still no black ink, and when I retry the Print & Scan Doctor" it keeps indicating a driver conflict - again asking me to uninstall and reinstall. I've had it with this thing