A few years ago I tried running Plex Media Server on my iMac, and gave up. I now have an new iMac, and have reinstalled it,. My Dish Hopper recognizes Plex, but I am unable to access any movie files. When I go to my Mac and click on a movie file, I get a message that the file is unavailable, and to check that the drive that the file is on is mounted. All of my movies are stored on an Western Digital external hard drive, directly connected to my Mac. Where do I go in Plex or other settings to makere that it is looking in the right location? Any help would be appreciated.