I put in a DVD to watch, and all it does is spin up, stop, and spin up again. It does this for several minutes, during which nothing will eject it, not even drutil tray eject in Terminal. Disk Utility hung on "gathering disk information", and i had to force quit. Then, there's a popup saying that the DVD is blank, when I know damn well it isn't. I finally got the disc to spit out. Anyone else had this problem?  Another DVD plays fine. Go figure. FYI, these are both commercial DVD's.