Disc tray on RDR-HX720 doesn't open and display

1 of 2 things
can you hear the motor running inside the player ????
there is usualy a snall pin hole under the tray insert a paper clip into this hile and push it in if tray starts to auto open it might be just a dry set of rails
if rails asumed dry open unit and coat the rails with anti seize and try again with the switch on front cover