If a case or sticker is blocking it, the computer might think you are in a dark room and lower the backlight to zero. Reset the System Management Controller (SMC) The SMC manages power management, including backlight behavior.
MacBook Pro Backlight Reset Fix Guide
If the keys are responsive but the screen does not change, the issue is likely software or hardware related rather than a simple setting change. Hardware failure of the LED strip or the display assembly itself.
A persistent black screen with power on indicates a failed LED panel or a damaged display cable. These range from simple user settings to complex hardware issues.
Resetting the SMC to Restore MacBook Pro Backlight
For MacBook Pro with Apple silicon, simply restart the computer. If the backlight works correctly in this environment, a login item or driver is likely the culprit.
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