I have a lexmark X75 and it isnt working correctly. I will tell it to print something and it will do everything like normal and when it is done printing there is nothing on the page. I did a printer test page and it came out, but looked like my black ink wasnt working. It is a used cartridge but isnt empty. Anyone know why my black ink might not be working, or why the printer isnt putting out black ink when there is a cartridge in it?