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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
Can you open the printer and take out the Toner Cartridge, then reseat it and tell me if it clears the error.
Can you put a new Toner in please an tell me if it clears the error.
No sorry, as it is either the Toner or the mainboard that has failed, this test will tell us this.
ok, he had direct access to it Jeremy, I needed to go through you and rule out the causes one by one, but you jumped ahead and did this with someone else, which makes it hard for me to solve it then...
Main thing is it is now working