* **macOS Finder misbehaving, unresponsive, crashing**
This occasionally happens after upgrade. The behavior has been observed in macOS High Sierra and, earlier, in OS X Yosemite 10.10x series. 
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Solution: On Finder, press Command+Shift+G and go to 

  ~/Library/Preferences/

Locate the file “com.apple.finder.plist” and delete it. 

{{ ::screen_shot_2017-12-17_at_2.56.55_pm.png?400 |}}

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"
  

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    * **Display of "?" after failed upgrade**
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Solution: (Re)install using full macOS ([[https://drive.google.com/uc?export=download&confirm=VdUU&id=0Bxh4azNOPD_QYlU1ZkpDOWd4MnM |macOS High Siera 10.3]]). Steps:

1. format medium (USB drive with at least 8GB) on MacOS Extended using Disk Utility
create bootable\\
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2. mount a full version of the new macOS version and from there, issue a command similar to this:


  sudo << /Applications/Install\ >>  macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -- volume /Volumes/UNTITLED && say Boot Installer Complete

For old machines, you may use [[http://dosdude1.com/highsierra/ |High Sierra patcher]]. 

3. Boot medium with Options pressed.