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iMac Boots into Black Screen with Flashing Cursor After Mavricks Upgrade

by on April 8, 2014

I’ve seen many people complain about this issue, and so I worked with Apple Care on this and they provided the fix below.

  • Power off iMac (hold down the power button until it shuts off)
  • Power back on
  • When you hear the chime, press Command+S. This will take you to boot the iMac into a command line.
  • Once at the command line, run the commands below.

Note: commands are case sensitive, so type them exactly as shown below. Also, you will need to hit Enter after each line.

mount -uw /

cd /Library/Preferences

mv oldlogin


From → Support

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