If the question mark appears only momentarily before your Mac starts up normally:
- Reset NVRAM.
- Make sure that your preferred startup disk is selected in Startup Disk preferences.
If the question mark persists, follow these steps:
Folder Icons For Mac Sierra
- Press and hold the power button on your Mac for up to 10 seconds, until your Mac turns off.
- Turn on your Mac and immediately press and hold Command (⌘) and R to start up from macOS Recovery.
- While in macOS Recovery, use Disk Utility to repair your startup disk.
- If Disk Utility found no errors or repaired all errors, reinstall macOS.
- If you still need help, please contact Apple Support.
Folder Icons Mac Os
How to change folder icon on Mac Right-click on a folder and select 'Get Info' Drag and drop an icon from the mac folder (.icns) on the icon preview located on Top left of the Get info dialogue. Add Custom Folder Icons. To get started with custom folder icons in macOS, first select the folder you’d like to customize. My screenshots in this article show folders on the desktop, but this process also works for folders you’re looking at in Finder. Just find or create your folder and click once to select it.