Question On Windows 10 sign in, background image doesn't load, and black screen when I yry tk sign in.

[MechaManDan]

Hi all, I'm using a Lenovo Y520, and recently it's started doing this thing where when I turn it on, it displays the background image of the lock screen as a missing file that says "Windows sign-in", and when I try to sign in, the screen goes black for an extended amount of time before putting me back on the login screen. No idea what could be causing it and I need this fixed by tomorrow. Any ideas?

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[Colif]

Try the advice suggested by MS:

Your Startup process is corrupt . . .

Start your PC, just as Windows attempts to load (spinning dots), press and hold Power Button for 5 - 10 seconds to perform a Hard Shut Down

Do this twice

On the third start Windows will boot into the Recovery Environment and from there you can access System Repair, Safe Mode, Command Prompt . . . etc.

Please try each option one at a time, then see of Windows will boot to the login screen . . .

Go to Troubleshoot - Advanced Option - Startup Repair
See if Windows startup can repair itself

Go to Troubleshoot - Advanced Option - System Restore
Check to see if you have a restore point you can go back to

https://answers.microsoft.com/en-us...-sign-in/4fea8b35-5f9e-48f7-ace2-48a34c0cdad4

if that doesn't help, you might need to reinstall windows.
On another PC, download the Windows 10 media creation tool and use it to make a win 10 installer on USB

Anything you want to save?

• on screen after languages, choose repair this pc, not install.
  
• choose troubleshoot
  
• choose advanced
  
• choose command prompt
  
• type notepad and press enter
  
• in notepad, select file>open
  
• Use file explorer to copy any files you need to save to USB or hdd
  

Otherwise - follow this guide: https://forums.tomshardware.com/faq/how-to-do-a-clean-installation-of-windows-10.3170366/