Windows 10: Background Replaced by "Windows Sign-in" image, Cannot Sign-in

When I booted up my Toshiba Windows 10 this morning, the normal sign-in screen with the default changing-image Microsoft background was replaced by a blown-out image of a "Windows sign-in" box pictured here: https://i.imgur.com/q86fIRk.jpg. Typically, you click somewhere on this screen to be taken to the textbox to enter your password, but I find that clicking anywhere on screen and hitting any button on the keyboard makes the screen go black for several minutes, after which I am returned to the same lock screen. I've tried holding down the power button to force a restart, but it returns me to the same screen. In short, I can't sign in and the computer is currently inoperable. Any suggestions?

:)

 

Sign-in Screen Background Image - Change in Windows 10

Follow this tutorial to change the sign in screen background image (Video on demand for @Cliff S)

Sign-in Screen Background Image - Change in Windows 10 - Windows 10 Forums

 

Windows sign in background pictures

Hi Gigi,

Setting up background pictures on your sign in/lock screen page is a great idea! You can find the images that comes with Windows by following these steps:

• From the Start menu, type in This PC then hit
  Enter.
• Once on This PC, look for the Pictures folder from the left side of the screen.
• Click the Pictures folder, then you will see the images/pictures that comes with Windows.

Let us know if this helps.

 

Cannot sign in microsoft account.

My device: Lumia 520. GDR2.
I cannot sign in my Microsoft account on my device. It didnt say any error but Microsoft account is not listed in Email and account list. When I click add button, it will show microsoft account option but after press sign in, it is still not shown in email
and account. Another problem is i cannot delete facebook account. Error code: 0x83cf1202. I have tried as suggested here: http://support.microsoft.com/kb/2475837/en-us#step0x83cf1202 but as my Microsoft account is not shown, I cannot do step 6.

Any suggestion?