After the Win10 test user upgrades 10074, the login interface only displays the black screen and the cursor. How to do

Microsoft officially released the new Win10 Insider preview version 10074, which brings a lot of new features and improvements. After Win10 test users upgraded to the latest version of 10074, it was found that Win10 only displays a black screen and a cursor on the login interface, and this problem occurs frequently. And pressing any button is invalid, restart is also invalid, what is going on? Can it be solved?

For the above questions, Xiaobian asked the official technicians to know:
We have solved the big problem Some users have similar problems with the same symptoms in Build 10061. Unfortunately, this problem for different reasons exists in the computer of a small number of users who install Build 10074. And we will study a solution.
At present, there is no better solution to this problem than restarting the computer. Sorry for the inconvenience caused by your use. Currently Windows 10 is still in the test development phase, please be patient and slowly improve the repair system. Thank you for using Microsoft products.
So there is no good solution for now, I can only wait for Microsoft to fix the error