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Make sure that the machine is turned on.
Press the Menu button.
Press the left left or right arrow to select Copy intensity and then press the OK button.
Press the left left or right arrow to select Manual adjust and then press the OK button.
Use the button to decrease the intensity or the button to increase it and then press OK.
Press the COPY button to return to standby mode.
Attempt to copy again.
Please let me know the results after performing those steps.
Unplug the printer from the wall outlet then wait 1 minute.
Plugin the printer and power on the printer then wait another minute.
Check to see if the issue continues.
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You unplugged the printer? That is different from just powering it off.
The unplug must be done while the power is on. Did you try it that way?
Unfortunately, those steps are differently from Canon and should fix your issue.