But once the contacts between them are loose, dusty, or damaged, the computer won't start up normally. A computer is composed of lots of hardware and firmware.Mac boots into a black screen if there is not enough or rated power, or if the battery is out of cycle count.If you have recently twisted the screen or dropped the Mac, a big possibility of your Mac's unresponsive black screen is hardware issues.The new updates could come with unsolved bugs, incompatibility issues, or very large disk space consumption.
MAC BLACK SCREEN ON STARTUP 2017 UPDATE
If you are facing the black screen of death issue after pressing the power on button in your Mac (MacBook Pro, MacBook Air, iMac or Mac Mini), don't be thrilled, even you can’t use your Mac normally or access the data on it, it doesn't mean the certain death of your device.