No display or dim display but computer appears to operate correctly

  1. Remove any connected peripherals.
  2. Try known-good power outlet, power adapter and power cord.
  3. Press F2 (with the fn key pressed and not pressed) to increase the screen brightness setting.
  4. Reboot the computer—hold down the Control and Command keys and press the Power button, or press and hold the Power button for 5 to 10 seconds to shut down the computer, then press the Power button to restart.
  5. Verify backlight cable and LVDS cable connections are seated properly and that the cables are not damaged (refer to display assembly replacement instructions).
  6. Replace display assembly.
  7. Replace logic board.

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