The System Management Controller (SMC) controls a host of basic Mac functions. If your Mac boots successfully into Safe mode, you can start uninstalling any new apps, disabling startup items, removing hardware, or undoing any other recent changes that may cause the problem. This doesn't load your startup apps, custom fonts, extra hardware features, or anything else beyond the basics. Safe mode runs a bunch diagnostic tests, then boots a stripped-down version of macOS. Keep it held until you reach the login screen, then continue as normal. On older Macs, press the power button and immediately press and hold the Shift key. Now select your main drive, press the Shift key, and select Continue in Safe Mode. On an M1 Mac, turn it off, then press and hold the power button until you see the Startup Options load. If your Mac shows signs of life when you power it on-if it won't go past the Apple logo or login screen, for example-then booting into Safe Mode may help you fix it. Were you installing apps, fiddling with fonts, or tweaking the system?
When your MacBook won't boot, try to remember what you were doing the last time it was working.
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