MF8280Cw PRINTER , its wont copy unless connect USB to computer

Hi , my MF8280Cw Canon printer copy a blank paper unless i connect USB to
computer then when i press copy its work fine, but when when plug out USB and press copy a blank paper come out . its new been 4 days since I bought it, and its been 2 days since the problem happend , i intialize all (set factory) and the problem stil , I will apperciated if i get  answer.