Please note: if no keyboard and mouse do this:
1-turn on your pc/laptop and interrupt windows loading by holding the physical power button on your pc/laptop (while windows loading, turn pc off) 3 times!!!!
2-after the 3rd time, your windows automatically goes into diagnostic mode!
3-You can then follow the explained procedure in the video
How to fix windows 10 stuck on welcome screen (solved)-How to fix windows 10 login problems Tutorial
#1: On your lock screen when you put in your password it goes back to lock screen where you need to put in your password again and again:
You just need to go into safe mode and log in to your windows in safe mode and then restart your computer. So follow this: Hold down the shift key and click on restart — Troubleshoot —f Advanced Options — Startup Settings — Click on Restart — Choose #5 to go into Safe Mode
Then use your password to login to Windows in Safe Mode. Once your windows come up in Safe mode, you just need to restart it then, using power button under the start menu. Your windows should restart back to its lock screen. Just put your password again to login to your windows.