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03-14-2011 05:56 PM
I have a HP laserjet 2840 all in one. I recently changed the black ink cartridge. Then it would only print or copy blank pages. So I installed a new black print cartridge (yes, i double checked I removed the tape). Still blank pages. I check the ink levels on the color cartridges and they are all OK. The drum is only at half level. Please help, what do I do now?