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Can you please remove the power to the printer (so unplug it from the power socket).
Then wait 10 minutes, connect the power again to the printer, turn it on and tell me please if it is now operating correctly.
Let me know the results please
Please note, the cartridges must fit perfectly into their slots. Try taking them out and paying very close attention to how you put them back in and tell me if this clears it please.