I did what most people suggested and ran the nozzle check/clean head MULTIPLE times. It took maybe 8 or 9x each for the printer to work again. Lesson that was learned is to use the printer every once in a while to prevent ink clogging or drying. It’s an expensive lesson because running the nozzle check and cleaning the heads that many times use A LOT of ink. So I suspect if this option doesn’t work for you it will likely be because you ran out of ink. If you have enough spare ink, just keep at it. The printer will work again.