Question about HP Officejet Pro 850 InkJet Printer

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I have an HP all in one 8500 pro series printer. it's only 3 months old. I cannot get it to print black ink anymore. I have cleaned the printheads and checked the ink. Even put in a new cartrige, but no luck. What am I missing?

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Hi .
It still looks to me as it is blocked some where so I would try.
Ok it got to be the heads blockage
There is fluid cleaner for this but I can never find any in the shops the only ones I seen is when they sell them in Tesco but they come in with the ink refill bottles so I just use worm water by it self on a cloth and dabbing on the heads to clean them, it will not harm the heads but not to much water.

Some heads are on the inks them self but some have them inside the printer so I not know your printer so if the heads are inside you need to get them out you may find that some heads will just clip out put some need to be unscrewed so you got to know how they come out so be careful and not push to hard on them, if the heads are on the ink then it is a easy job to clean them,
It worth a try it worked for me more than ones.

Please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
All The Best: Pineworks

Posted on Feb 02, 2010

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2 Try the following solutions in the order presented to resolve the issue. When one of the solutions resolves the issue, there is no need to continue troubleshooting.
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  5. Unplug the product power cord from the electrical outlet. NOTE: Do not turn the product off by pressing the Power button (c01602202.gif ). This causes the carriage to move out of reach.
  6. Lift the printhead latch. Figure 1: Lift the printhead latch c01817489.jpg
  7. Lift the handle on the printhead that the error message indicates is missing or damaged, and then pull the printhead out of its slot. Figure 2: Lift the handle to remove the printheadc02548320.gif
  8. Use a dry, soft, lint-free cloth to remove any ink from the electrical contacts on the printhead. CAUTION: Wipe only the electrical contacts. Wiping the ink nozzles, located on the underside of the printhead, can damage the printhead. Do not touch the nozzles. Doing so permanently damages the ink nozzles, and the ink stains clothing. Figure 3: Electrical contacts and ink nozzles c01817491.jpg 1 - Electrical contacts 2 - Ink nozzles
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