After I change color cartridges, black ink stops printing. This is the 2nd time this has occurred on this machine. I have followed all diagnostic tools/steps to no avail. Last time this occurred, HP said it was a cartridge malfunction and replaced my 902XL cartridge. This is the exact same issue. I put in a new 902 XL and it is printing fine. So I have a half full 902XL that will not print...again. Also experiencing constant "paper jam" errors.
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