Flashing question mark when starting Mac


When you turn on your Mac, you a see a flashing question mark. It may continue to load up normally.


If you are able to login after seeing the question mark:

  1. Click the Apple icon in the top left of the screen.
  2. Click System Preferences.
  3. Click the Startup Disk option.
  4. Select the main hard drive which you have Mac OS X installed on.
If the screen stays on the question mark:
  1. Shut down the Mac (hold down the power button to force it to turn off if you need to).
  2. Turn it on and hold down the alt key.
  3. You should have a menu asking you to choose a hard disk. Click on you main hard drive.

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