File with a question mark is flashing on my screen

Usually that means your mac cannot find a startup disk

~ or no longer has a workable system in its drive.

• If your Mac starts up to a Question mark - Apple Support

https://support.apple.com/en-us/HT204323

Other links within this topic include what else may be done;

such as a process to restart into macOS Recovery & reinstall.

However that may not necessary, to that depth. But could be.

You'd try to use Disk Utility from booted macOS Utilities and

see if that may be useful to Repair the system files on drive.

Good luck & happy computing!🌞⛵️