Mac Flashing Folder with Question Mark

Overview

Mac flashing folder with a question mark on startup means the Mac cannot find a valid boot volume or operating system.

Key Details

• Folder with "?" icon flashes on screen during boot
• Mac cannot locate macOS on any connected drive
• Can indicate disk failure, corruption, or wrong boot disk
• Common after drive replacement or macOS reinstall failure

Common Causes

• Startup disk setting pointing to wrong volume
• macOS system files corrupted or deleted
• Internal drive failure or disconnection
• Boot Camp partition set as default incorrectly

Steps

1. 1Hold Option key on boot to select the correct startup disk
2. 2Reset NVRAM: restart and hold Option+Command+P+R
3. 3Boot into Recovery Mode (Command+R) and reinstall macOS
4. 4Check if drive appears in Disk Utility from Recovery

Tags

More in Startup

Frequently Asked Questions