Follow these steps to use the Photos library repair tool:
- Hold down the Option and Command keys while you open Photos on your Mac.
- In the dialog that appears, click Repair to start the repair process.
Apr 01, 2020 Mac startup key combinations Learn about the Mac features and tools that you can access by holding down one or more keys during startup. To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to restart. Apr 19, 2012 Remove these Startup Items manually by opening a new Finder window and pressing Command + Shift + G, and then typing in the following directory path: /Library/StartupItems. Move any of the files in this folder to another location (like. Your Desktop), and then restart your Mac to make the changes.

Mcminnville Library Website
You might be asked to type in your user account password to authorize the library repair.
The repair tool analyzes the the library's database and repairs any inconsistencies it detects. Depending on the size of your library, this might take some time. When the process is completed, Photos opens the library.
Mac Library Startup Items
If you repair a library that's automatically updated with iCloud Photos, the entire contents of the library re-updates with iCloud after the repair process completes.
Boot Camp Control Panel User Guide
You can set the default operating system to either macOS or Windows. The default operating system is the one you want to use when you turn on or restart your Mac.
Set the default operating system
In Windows on your Mac, click in the right side of the taskbar, click the Boot Camp icon , then choose Boot Camp Control Panel.
If a User Account Control dialog appears, click Yes.
Select the startup disk that has the default operating system you want to use.
If you want to start up using the default operating system now, click Restart. Otherwise, click OK.
You can’t change your startup volume to an external FireWire or USB drive while you’re using Windows.
To learn how to change the default operating system using macOS, see Get started with Boot Camp.
Restart in macOS

In Windows on your Mac, do one of the following:
Restart using Startup Manager: Restart your Mac, then immediately press and hold the Option key. When the Startup Manager window appears, release the Option key, select your macOS startup disk, then press Return.
If you’re using a portable Mac with an external keyboard, make sure you press and hold the Option key on the built-in keyboard.
Restart using Boot Camp Control Panel: Click in the right side of the taskbar, click the Boot Camp icon , then choose Restart in macOS.
This also sets the default operating system to macOS.
For more information about restarting in macOS, see the Apple Support article Switch between Windows and macOS.