problem chart iMac

Hi I have an iMac mid-2011 with Sierra installed. I experience a problem during startup. When the progress bar reaches 1/3 of the total, it stops and displays a bar of color on the screen and immediately thereafter, the screen goes black for a second, and then return to the display of progress bar and the Mac end commissioning successfully however. I have attached the picture where the color bar is displayed. Thank you, Francesco

Hi frawarrior,

Thank you for using communities Support from Apple!

I understand your message that on initial boot, your Mac will be stuck on the Apple logo with color bar screen, but then it restarts normally on its own.  To help get this problem solved, I would you please start in safe mode, and then restart your computer normally.  Please report back with what is happening:

Start in safe mode

Follow these steps to start in safe mode.

  1. Start or restart your Mac.
  2. As soon as you hear the startup tone, hold down the SHIFT key.
  3. Release the SHIFT key when you see the logo Apple appears on the screen.

After the Apple logo appears, this may take longer than usual to reach the login screen or your office. This is because your Mac performs a check of directory of your drive to boot in safe mode.

To leave safe mode, restart your computer without pressing any keys during startup.

Try safe mode if your Mac does not end commissioning

Take care.

Tags: Mac

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