By A Mystery Man Writer
If your mac is having trouble recognizing a replacement battery or other components, you may need to repair your main disk permissions. Follow this
Verifying and Repairing Permissions in OS X
How to repair a Mac disk with Disk Utility - Apple Support
How to repair a Mac disk with Disk Utility - Apple Support
How to upgrade a Mac: Swap in new RAM, graphics card, hard drive
Guys I'm scared 😭 my life is on my computer and I don't know how
DIY Demo: Just How Easy Is It to Fix Your Phone's Shattered Screen
How to Start Up a Mac in Internet Recovery Mode - iFixit Repair Guide
Tech Tip: How to repair disk permissions on a Mac
How to Install macOS High Sierra - iFixit Repair Guide