Question mark Error
After I finished cleaning out my MacBook Pro, I did a restart. When the computer restarted, All I see is a folder with a question mark
MacBook Pro 13″, OS X 10.11
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• If your Mac starts up to a question mark - Apple Support
https://support.apple.com/en-us/HT204323
"..A folder with a flashing question mark means that your startup disk is
no longer available or doesn't contain a working Mac operating system."
Of two-sections, second part suggests
"..If the question mark persists, follow these steps.."
- Press and hold the power button on your Mac for up to 10 seconds, until your Mac turns off.
- Turn on your Mac and immediately press and hold Command (⌘) and R to start up from macOS Recovery.
- While in macOS Recovery, use Disk Utility to repair your startup disk.
- If Disk Utility found no errors or repaired all errors, reinstall macOS.
- If you still need help, please contact Apple Support.