Dock does not open
Previously downloaded a file (from a reputable source). It appeared in the Dock. Later, restarted system. Dock didn't display. Restarted again. Nothing. Via Terminal entered "killall Dock". Nothing.
Restarted system in Safe Mode. Nothing. Haven't encountered this before.
???
Edit: Also, opened Dock in System Preferences and selected different options. Nothing.
iMac 21.5", macOS 10.15