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A Macbook screen goes black randomly, sometimes completely black and sometimes near black (you can still see the GUI).

This happens in OS X Yosemite and also during USB (Mavericks) (Yosemite) install wizards. However the screen remains perfectly bright in the boot selection menu.

You can see it clearly in this video.

enter image description here

As mentioned in the video the model is Macbook mid 2009.

Issues:

  • F1 and F2 keys don't affect the brightness levels. However they appear to help to wake up the screen for short periods of time.
  • Battery does not affect the screen state.
  • The screen is always bright during the Boot selection menu.
  • Screen rotation does not affect the display.
  • Display brightness is set to 100% and Power options are set to max with or without battery.
  • The problem started after upgrading Mac OS X Leopard to Yosemite.
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  • To eliminate possible 3d party app doing that, start in Safe mode, hold shift key during boot. @bmike , this is not a answer, just troubleshooting :)
    – Ruskes
    Apr 5, 2015 at 2:20
  • try pressing CTRL+OPT+CMD+T to see if it helps with dark screen.
    – Ruskes
    Apr 5, 2015 at 2:43
  • @Buscar웃 thanks for your suggestions. Safe Mode behaves just like normal boot (lots of black screens), and CTRL+OPT+CMD+T doesn't seem to do anything so far.
    – Gabriel Meono
    Apr 5, 2015 at 3:40
  • OK, lets do some hardware test. Hold D key during start up. support.apple.com/kb/PH18765?locale=en_US
    – Ruskes
    Apr 5, 2015 at 3:47
  • Pressing D or OPT+D only works if the retail DVD is inserted, this message appears after the language selection: Apple Hardware does not support this machine. The DVD that came bundled with the Macbook is Mac OS v 10.5.2 AHT v 3A140 Disc v 1.1 2Z691-6208-A. Could Yosemite destroy the Apple Hardware compatibility?
    – Gabriel Meono
    Apr 5, 2015 at 5:47

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