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The Folder with Question mark indicates that your Mac can't find the hard drive or the system files to boot. This usually happens if the hard drive of your Mac is failing or failed.
We can try some basic troubleshooting steps and see if that works or not.
Reset PRAM and NVRAM
- Shut down your Mac
- Locate the following keys on the keyboard: Command, Option, P, and R.
- Turn on the computer.
- Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears and before the chime sound.
- Hold the keys down until the computer restarts and you hear the startup sound for three times.
- Release the keys.
Restart in Safe mode
Make sure that the computer is shut down. Press the power button. Immediately after you hear the startup tone, press and hold the Shift key. Release the Shift key when you see the gray Apple and progress indicator. Let the Mac boot up...
Run Disk Utility in Single User Mode
Turn your Mac off. Turn it back on and this time hold down the Command (Apple) key and the S keys at the same time. This will boot your Mac into Single User Mode. Then type the following command...
/sbin/fsck -fy (note the space between fsck and -fy)
If you can't run /sbin/fsck -fy then type only fsk - fy
Hit return and the disk utility should run and let it finish. When it finishes and there is no error, then type reboot and hit return. Let the Mac boot up. (Disk Utility will fix all system errors, bad preferences files etc)
Please let me know if that didn't work, so we can continue troubleshooting. Don't Rate my answer until you are satisfied.