I have the same issue and i tried every answer including the accepted answer with the repair tool.
Also i've noticed that Windows Security Service is just do not exist in my system.
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Dear sir, I have been trying to solve the problem with Windows 11 security black screen for a long time. From what II've seen its too technical and long winded, I have give up on trying. Can you help with a simple link to solve the problem PLEASE, thanks. Tony
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I have the same issue and i tried every answer including the accepted answer with the repair tool.
Also i've noticed that Windows Security Service is just do not exist in my system.
Please try the accepted answer here.
Windows security stuck on black screen after opening. - Microsoft Community: https://answers.microsoft.com/en-us/windows/forum/windows_11-security/windows-security-stuck-on-black-screen-after/347ae039-5439-405d-83e1-fbfabbe23712
Hello,
See if this fix helps you:
https://www.kapilarya.com/fix-windows-security-blank-in-windows-11
Let us know if this helps!
Note: Included link in this reply refers to blog post by a trusted Microsoft MVP.