There is a paper detect sensor which sits in the frame of the machine above the paper tray. Pull the paper tray out and make sure this sensor didn't get broken or knocked out of place. (If you have a can of compressed air, shoot some into the sensor to get rid of possible paper dust.)
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There is a paper detect sensor which sits in the frame of the machine above the paper tray. Pull the paper tray out and make sure this sensor didn't get broken or knocked out of place. (If you have a can of compressed air, shoot some into the sensor to get rid of possible paper dust.)