![]() There could be different issues such as power, software, hardware incompatibility, third party apps, cables not connected, etc. Turn on the ambient light sensor so your Mac can automatically adjust brightness based on current ambient lighting conditions. Press the increase brightness key to check or adjust the level of brightness. Make sure the display brightness is not turned off. Depending on the age and model of your Mac computer (Be it a Mac mini, iMac, MacBook Air, or a MacBook Pro), except for the black screen of death, you might see a blank, gray, or blue screen. There can be some unknown reasons caused by a motherboard failure.
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