I bought a brand new MF726 CDW in 2016. But I did not open until a year later. The COPY or SCAN function outputs a blank page while the print function is O.K. I notice that the scanning light in Platen Glass never lid up even though the motor and bell are still moving the whole scanning assembly at Platen Glass. I google and it was suggested to update new firmware for other MF model. I tried to update new firmware on my MF726 and it did not help. Since then I only use PRINT function. I am wondering what might have gone wrong with the brand new MF 726? Thanks and regards.