I have a c309n and replaced the black ink cartridge and now it will not print black. I've cleaned the printheads and aligned the cartridges...more than once. I've also tried turning the printer off, unplugging it, then turning it back on. I've read the articles and checked the vents, too. None of this has worked, the black still does not print. Please help. My warranty is expired (in 2011) and the printhead has a date from 2009. If it requires a new printhead, what is the price for that?
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