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Aporte original por: originalmachead ,


'''Connect to an external monitor'''... if there's no image there when the on-board display is black it's your GPU/VGC, however if the external monitor looks fine when the display is black it's your on-board display  chain... possibly your inverter or display itself.

Run your Apple Hardware test - you may have to run it more than once if your problem is intermittent.

The diagnostic LED lights can also point to a problem area.

''If this answer is acceptable '''please remember to return and mark it'''.''