How old is the laptop? Is it still under warranty? If it is under warranty then call Dell Tech support. If the warranty is gone then check the bottom of the laptop and see if there is a small screw holding the drive in you laptop. You should be able to remove the drive by sliding it out of its bay and then reinstall it to make sure it is making good contact. See if it shows up in your device manager. If you do not see it then something is either bad on the dive itself or you laptop Mobo. If you have a disk stuck in the drive you can remove it by inserting a straightened out paper clip into the tiny hold on the front of the drive.