Premiere Pro playing video but the screen is all black

Please use the free MediaInfo and post a screenshot the properties of your media in tree view:
https://mediaarea.net/en/MediaInfo

If the file is variable frame rate, which although Adobe says it will support, many users are having issues with VFR.

Use Hand brake to convert to constant frame rate:
https://handbrake.fr/downloads.php
Here is a tutorial:
https://www.youtube.com/watch?time_continue=34&v=xlvxgVREX-Y

Also:

If that doesn't work, try Preferences > Audio Hardware and set Input to None.

If that doesn't work, try resetting the Workspaces:
Reset a workspace
Reset the current workspace to return to its original, saved layout of panels.
1. Do one of the following:
• Click the Workspace menu icon and select Reset to Saved Layout.
• Choose Window > Workspace > Reset to Saved Layout.
from here:
https://helpx.adobe.com/premiere-pro/using/workspaces.html

And also please try to

1. Clean media cache
2. Delete render files
3. Trash preferences 

Can you please try to

1. Go to Premiere top bar and -> FILE
2. Project Settings -> General
3. Change the “Renderer” to -> the default option which is the “Mercury Playback Engine Software Only” or other option (that you might have)