MY HP P3005n is printing blank pages - re-booted changed toner- no change r?

HP Laserjet P3005n printer had a black line down pages so took out toner cleaned the roller - had a job putting back the toner -then no print on the page - thought I had broken to the toner cartridge so put in a new one - still blank pages - re-booted checked all leads server connections - still nothing other printer working okay - can you suggest what I must try next