TomsOfDoom Said:
"I've already tried all of those options and don't have a way to remove the hard drive from the computer at the moment. That's why I was asking if there is a way to access it by a USB connection to another computer. Thanks"
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No. You need reinstall the macOS, or get this serviced. The question mark means either your OS if corrupt or the Hard Drive has Failed.
So, Three Steps:
I. Use First Aid in Recovery Mode:
- Boot: into Recovery Mode [Hotld Down: command + R upon boot]
- Select: Disk Utitlty
- Click: the hard drive
- Click: the First Aid button
- View the symptoms
If no issues, then reinstall the MacOS:
II. Reinstall the macOS:
Nothing would be lost, it's just that sometimes changes are made to your system, and then then processes become corrupted, technically. When reinstalling, deleted files are reinstalled, and misplaced files are moved back to where they should be. Go Here: How to Reinstall macOS from macOS Recovery - Apple Support.
If of no success, then go about getting this serviced:
III. Contact...
A. Your Local Retailer (With Certified Associates):
View the store's reviews online.
Or...
B. An AASP (Apple Authorized Service Provider):
- Go Here: Find Locations - Apple Authorized Reseller
- Click: Service & Support
- Enter: your location information
- See: if there is an AASP nearby
- Contact: an AASP that shows up, and find out more about the services that they offer to fix the iPhone