Check if the battery of your MacBook is drained. 2. Disconnect all external devices, press the power button for 10 seconds to force the Mac to turn off, and then turn it on. 3. Reset NVRAM and SMC. 4. Boot in Safe Mode and disable login items in System Preferences. 5. Run First Aid in macOS Recovery Mode to check the startup disk. 6. Recover data and reinstall macOS.