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Turn the printer on and open the lid. After a short while, the printer
carriage unit containing the print head and ink cartridges will stop
right in the middle of the printer, so you can easily replace the ink
cartridges. After replacing them and ensuring they're fully seated,
simply close the lid. The printer will run a few quick self-diagnostic
checks and run a purge cycle, and it'll be good to go.
To get your cartridge installed, first turn your printer off. Open the lid like you normally do to change it. You can physically pull the cartridge carrier to the middle to change it. It will not hurt anything. Just be sure your printer is powered off. You see when it is on, the software keeps track of what character position the printer head is in. Like when you tried to stop it from printing it went to the left or home position because the printer software detected that it was not moving and printing in the right positions of whatever it was that you were printing. So good luck and God bless you. Once you power the printer back up after changing the cartridge everything will work and position itself just fine.
Move the ink cartridge carriage (the printhead) to the middle of the printer like you're going to change cartridges. Take out all the ink cartridges. There should be two black springs on either side of the printhead. Remove these and the printhead should pop out. Clean the nozzels (the little parts that squirt out ink) and reassemble.
If this doesn't work, then you'll have to replace the printhead.
It appears that the injection may have been lethal, it was still using the ink that it carries in its tubes then it mixed with the injection and is now blocked \ faulty. To repair it you could try getting a new set of HP inks.