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Open the printer and remove all cartridges. Turn off the printer and disconnect all cables from the back of it. Use a q-tip dampened with warm water to clean the copper contacts on the cartridges and in the printer. Keep cleaning until no ink comes off on the q-tip.
Next, check all the ink cartridges and make sure that any prepackaging has been taken off:
Then make sure they are vented correctly:
You can use a pin to clear the vent if necessary. Now, reinsert the ink cartridges and reconnect all cables to the back of the printer. Plug the printer back in to the outlet, then turn the printer back on, and run a few more printhead cleanings as we did earlier. Please let me know how that goes, I can give you some special steps to soak the printhead and clean it if needed.