Hi there, I had the same problem with my HP2050 / J510 series printer. Other simptoms besides not printing in black were printing letters partly (upper or lower part only) and printing only fist, third and fifth line while omitting the second and fourth line and so forth. After following various tips on this forum that did not work, I decided to remove the black ink cartridge and inspect the electrical contacts and the printing surface. The contacts were OK but the printing surface was smeared with black ink. I used an ordinary cotton swab, dipped in bottled water and squeezed out the excess, to carefully clean the printing area until it looked transparent. After this excellent printing was restored.
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