Atapi Dvd A Dh20a3s

hi guys my lite-on dh20a3s dvd burner its not working right its been doing this problem for 3 weeks now for some reasson if i pop a dvd disk into the drive the light on the drive will stay green at all times not even flash or anything and when i try to eject the disk it would let me it dose this tell i restart the pc and some times when i hit the eject button i cant get the tray to close tell i restart the pc