How to fix flashing folder question mark issue on Mac OS?

What causes How to fix flashing folder question mark issue on Mac OS?

Inefficiencies of bootable drives
Faulty startup disk
Incorrectly configured USB drive
Cyber infections
Inability to find an installed bootable drive

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A flashing folder with a question marks appears every time I try to start up to Mac OS. Rebooting the device and reinstalling hard drives did not help. Any ideas how to solve this?

The issue of flashing question folder mark might take different forms. Some users report the problem to take only several seconds; other complain of not being able to enter the operating system at all. Though there are different speculations about the main reason for such behavior, there is a prevailing opinion that the problem is related with the inefficiencies of bootable drives. The majority of users who encounter this problem cannot proceed further since this bug prevents from loading the screen permanently. Solve the problem by using one or several solutions provided below. Alternatively, startup disk might be at fault for this recurrence. Proceed further by reviewing one of these options.

Option 1. Reselecting startup disk on the system

Opt for System Preferences from the Apple menu.
Click on the Startup Disk icon.
Select the icon of the volume you normally use to start up the device.
Exit the System Preferences window.
Reboot the system. Afterward, the device should start normally without any disturbances.

Option 2. If you cannot find an installed bootable drive

Boot the computer from a bootable USB flash drive. Press and hold down the option key while restarting the device. In te newly opened list, locate all available drives for rebooting. If this method is ineffective, then the USB drive might be configured incorrectly. We also suggest running MacKeeper [rev id=”MacKeeper”] to check the system for cyber infections which might cause such phenomenon.

Option 3. Mac fails to startup, flashing question mark remains

Turn off the device by pressing and holding the power button for a few seconds.
Press the power button once to turn your Mac back on. After hearing the startup sound, immediately press and hold the Command and R keys to initiate Mac OS X Recovery. Keep holding the two keys held until you notice an Apple logo.
Choose a wi-fi network to connect to the Internet as part of a startup.
When the recovery screen emerges, navigate to the Apple menu and click Startup Disk.
Choose the one you would prefer and initiate the process with clicking Restart.

Bottom line

To fix the flashing folder question mark issue, you can reselect the startup disk, boot from a bootable USB drive, or initiate Mac OS X Recovery. If these solutions do not resolve the problem, consider checking for cyber infections or further diagnosing the startup disk.

Frequently asked questions

Can the flashing folder question mark issue on Mac OS affect files shared with Windows 10 or Windows 11?

Yes, if you have shared files between Mac OS and Windows, the flashing folder question mark can indicate issues that may affect accessibility on both operating systems.

What should I do if I see a flashing folder question mark when accessing a shared drive from Windows 10?

Try reconnecting to the shared drive and ensure that the network connection is stable; if the issue persists, check the drive's settings on the Mac.

Is there a way to troubleshoot the flashing folder question mark from a Windows 11 computer?

While Windows 11 cannot directly fix Mac-specific issues, you can verify network settings and ensure that the Mac is properly configured to share files.

Did this fix work for you?

Written & verified by

Sarah Chen

Cybersecurity Analyst

Cybersecurity Threat detection Security hardening Data protection Vulnerability assessment

Sarah Chen is a cybersecurity analyst focused on protecting Windows systems from emerging threats and preventing data breaches. She covers security hardening, vulnerability assessments, and post-infection cleanup for home and small business users. Sarah translates complex security concepts into practical hardening steps — firewall configuration, exploit mitigations, secure boot settings, and defence-in-depth practices that meaningfully reduce attack surface. She stays current with the threat landscape and contributes security advisories to the uGetFix news section when new vulnerabilities affect Windows users.

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