Read page 76, hopefully you will be able to restore factory settings without removing the battery, but the problem will stll be there, as reseting to factory setting wont reset copy settings..
If reseting it doenst work, see if you can make a color copy (I assume you are making a black and white copy). Some printers, even with black ink dead can still make black and white copies using the color cartridge.
I would suggest that before you buy ink at a retail store, you make sure s not expired. I used to work at RadioShack, so I know that 40% of the cartridges they carry are expired but most associates don't even know about that problem.