I got an external blu ray from ebay. The external shows "the spy next door" on my samsung np-rv515-a01us. But on my mac mini and my dads macbook pro it just spins and doesn't even show on the desktop. Even regular dvd doesn't work. Its not broken or it won't show in my windows 7 laptop. But mac for some reason refuses to work. And my regular external dvd burner also usb works. So why not the blu ray.