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(Topics range from OS/software updates and troubleshooting, to hardware upgrades and repairs.)Apple Support/How-To Article Updates: - What to do if your Mac won't turn on - How to reset NVRAM on your Mac - List of Startup key combinations for Mac - How to set a firmware password on your Mac - How to use safe mode to isolate issues with a Mac - How to Use File Vault to encrypt the startup disk on your Mac - How to use LG Ultra Fine 5K Display with your Mac - Why you may see a progress bar when Mac wakes from sleep = Top of Page = Copyright © 1997-2017.