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You may want to verify that there is no damage to the face of the print head. Also, run a normal cleaning and make sure the wiper is making good contact with the head during the wipe process.

I have had some success pressing the enter button a few times applying moderate pressure. Then restart the printer. Sometimes on older units the keys can get stuck. If that doesn’t work the Keypad panel assembly is only about $160 and takes a few minutes to replace.

If your printer is still under warranty I would definitely not use expired ink that old. Once your past the warranty stage it’s really up to you if you want to take a risk on damaging the print head. It may or may not cause issues but if it does your looking at 3k for a new head.

Heads on the EX model are around $3600 to $3700 plus travel and labor cost. They normally take around 90min to 2 hours to install and calibrate.

Did you leave the printer plugged in with the main power switch on so it could do automatic cleanings during the two months you weren’t using the printer?