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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 tell me the make and model of the printer please
Right click it there and select printer properties
Then print a test page and tell me if that prints please
ok, so it prints out test prints from this Mac? And they look correct?
ok, strange as normally it would not be able print a test page... yet you indicate it can.
If its in use, it means it may be processing a job from another computer or device.
Is there anything else trying to print?
ok, remove the power to your wifi router and the printer and wait 5 minutes.
Then connect the power to the wifi router and wait 5 minutes
Connect the power to your printer, restart the mac and tell me if it then prints please
No to the wif router please, the box that provides the wifi network
yes thats ok, but you just disconnect it from the power socket, so pull the power plug out from the wall