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Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

bad color of screen dark/black/white

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suddenly the screen color has changed to very dark black and photographs look like negatives

suddenly the screen color has changed to very dark black and photographs look like negatives

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Does this help?

Option-Control-Command-8 : Invert/revert the screen colors