The Most Comprehensive Windows 10 Black Screen Trouble shooting Guide
There have been Many, many ... Win 10 Black screen Issues on this Forums & other forums
This is Simply the Best Guide I have Found only 6 pages
Black screen no more
How to fix black screen problems on Windows 10
When your Windows 10 PC displays a black screen, use this guide to troubleshoot and resolve this issue.
EDIT: 
Microsoft information - troubleshooting guide
Troubleshoot black screen or blank screen errors Applies to: Windows 10
Step one - choose one of the --> When did you get the error?
- Before signing in to Windows 10 I see a black or blank screen
- After signing in to Windows 10 I see a black or blank screen
- After restarting my device I see spinning dots on a screen that's black or another color
Under: Before signing in to Windows 10 I see a black or blank screen
Action 3: Remove third-party antivirus software
Sometimes third-party antivirus software causes black or blank screens. You can temporarily uninstall third-party antivirus software to determine if it's causing the screen issue, then reinstall it after your device is back up and running. Your device won't be unprotected because Windows Defender Antivirus kicks in if no other antivirus software is running.
Get more info about Windows Security.
Edit Update: added the following to the first post to make it easier to find Troubleshooting black or blank screens in Windows 10(excerpt)
If you experience a black or blank screen on your Windows 10 device, try the following:- To wake the screen, use one of the following keyboard shortcuts: Windows logo key + P or Ctrl + Alt + Del
- For a black screen, use the following keyboard shortcut: Windows logo key + Ctrl + Shift + B.
- For more info, see Troubleshoot black screen issues on Windows 10.
EDIT 21 October 2021 ---> blank screen on boot using Display Port with a 3080 Ti or 3060 = then Read This Thanks Mister E..
https://forums.evga.com/FindPost/3486301 Mister E...
If you're experiencing a blank screen on boot using Display Port with a 3080 Ti or 3060 than this is for you:
NVIDIA Customer Care on Twitter
NVIDIA Support Page