If the drive doesn't spin, the bearings are likely "frozen up" and the spindle motor can't break it free to start it spinning. You could try removing the drive and physically hold it in your hand and twist it back and forth vigorously, as if trying to make the platters inside turn back and forth. This commonly breaks up this seizure and allows the drive to spin again.

This is usually caused by letting the drive sit for a long period of time without running. Even a couple years could do it. If you can successfully get it to spin, it may very well continue to be a reliable drive.