![]() ![]() Restart and let it boot normally, without holding down keys.In the Terminal window type: csrutil enable.If it works you should be prompted for your system password.In the Terminal window, cut and paste from this page, or type: name=/System/Library/Frameworks/amework/Versions/A/DVDPlayback sudo perl -i.saved -pe "s,\000Internal\000,\000External\000,sg" "$name".Open the Terminal (From the menu bar choose Go > Utilities, then Terminal).Restart the Mac and let it boot normally, without holding down keys.A message will tell you that the action was successful In the Terminal window type: csrutil disable.Ignore the options in the window and choose the Terminal from the menu bar.Hold down the Command R keys when you hear the restart tone. SOLUTION: Here is the quick summary of the fix: When I upgraded, El Capitan “fixed” my modified DVDPlayback file during the upgrade, so it no longer pointed to the external DVD. This is done by modifying the DVDPlayback file. It needs to be told where to look for an external DVD drive. The operating system expects an internal DVD player. ![]() I have removed the optical drive and replaced it with a custom tray that holds a hard drive. ![]() ĬAUSE: My MacBook Pro had a built-in optical drive. PROBLEM: After upgrading to El Capitan, I got the following error when I tried using my external optical drive to play a DVD:Ī valid DVD drive could not be found. Update: I upgraded to High Sierra and followed these instructions to get my external DVD working again. ![]()
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