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This occasionally happens after upgrade. The behavior has been observed in macOS High Sierra and, earlier, in OS X Yosemite 10.10x series.
Solution: On Finder, press Command+Shift+G and go to
~/Library/Preferences/
Locate the file “com.apple.finder.plist” and delete it.
The alternative is to delete the file from the commandline or Terminal:
~/Library/Preferences/com.apple.finder.plist
Reboot the machine afterwards. Or from the commandline:
sudo shutdown -r now "Restarting Now"
<hr>
* **Display of "?" after failed upgrade**
Solution: (Re)install using full macOS ([https://drive.google.com/uc?export=download&confirm=VdUU&id=0Bxh4azNOPD_QYlU1ZkpDOWd4MnM OS X High Siera 10.3]). Steps:
1. format medium (USB drive with at least 8GB) on MacOS Extended using Disk Utility
create bootable
2. mount a full version of the new macOS version and from there, issue a command similar to this:
<pre> sudo « /Applications/Install\ » macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia –volume /Volumes/UNTITLED && say Boot Installer Complete </pre>
For old machines, you may use [http://dosdude1.com/highsierra/ High Sierra patcher].
boot medium with Options pressed.