To fix a Mac black screen, start with simple steps like forcing a restart (hold power button 10s), checking brightness keys, disconnecting peripherals, and charging; if that fails, reset the SMC (Shift-Control-Option + Power) and NVRAM (Option-Command-P-R), boot into Safe Mode to check software, and finally try reinstalling macOS from macOS Recovery (Command+R) to resolve deeper system issues. Hardware problems, like a faulty display, may require professional service.
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