We have an HP J6400 printer. It's worked fine for as long as we've had it (a couple years), but today it stopped printing in colour. I know that the cartridge is full because it says full on the ink levels, and I replaced it. I have done everything I can think of including realigning cartridges, cleaning cartridges, changing cartridge, printing test page (which comes out only in black), checking my printer to make sure it's not on a generic laser and actually on J6400, and doing many series of tests. Also, the printer is acting very slow now. It's taking like 20 minutes to print one page, which is unusual. If anyone can help it would be greatly appreciated, thank you.
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