I am using inbuilt keyboard only. Macs will refuse to boot into safe mode if a firmware password has been enabled. If that's your issue, boot into recovery Command-R , launch firmware utility from the Menu Bar, and turn off the firmware password. Then restart the computer and hold the shift key. You will need to enter the firmware password which it seems you don't know?
Fixed: Mac Won't Boot/Start after macOS High Sierra Update () – EaseUS
Release the shift key once you see the login window or the desktop. When you hear the Macs startup sound, press and hold the shift key. With your Mac running in Safe Mode, you can troubleshoot the issue you were having, such as by deleting an application that's causing problems, removing a startup or login item that's causing issues, or launching Disk First Aid and repairing permissions.
You can also use Safe Mode to initiate a reinstall of the current version of the Mac OS using a combo update.
2. Reset the SMC
Combo updates will update system files that may be corrupt or missing while leaving all of your user data untouched. In addition, you can use the Safe Boot process as a simple Mac maintenance procedure, flushing many of the cache files the system uses, preventing them from becoming too big and slowing some processes down.
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- Check the Hardware!
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- Using Built-In Recovery Options!
He is the president of Coyote Moon, Inc. Perform a directory check of your startup drive. Load only the bare minimum of kernel extensions OS X needs to run.
How to Use Your Mac's Safe Boot Option
These are the fonts supplied by Apple; all third-party fonts will be disabled. Move all font caches to the trash. Disable all startup or login items. Delete the dynamic loader cache OS X This can fix problems that cause a blue screen freeze at startup. DVD Player won't work. Devices connected to the audio in or audio out won't work. Internal or external modems won't operate.
AirPort cards may not function.
- Check for electrical issues!
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- Make sure it isn’t a screen issue;
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- A fix for OS X hanging at startup, even in Safe Mode.
This depends on which version of the card and which version of the OS is in use. Quartz Extreme won't run.