Win10 preview version 10061 lock screen interface black screen solution

At present Microsoft has launched a repair patch KB3055415 for this problem.
Specifically, the user may have a black screen on the login or logout page, and only one mouse pointer appears. At this point, the Alt+Tab and Ctrl+Alt+Del key combinations have no effect, so the user cannot log in to the system normally.

In this regard, Microsoft also gave a temporary solution on the patch introduction page, as follows:
• In the case of black screen, press the physical Ctrl key (in this case, any virtual keyboard does not work) After pressing the Ctrl key, the mouse will be moved to the "invisible" login password input box)
• At this point you can enter the login password and press Enter to enter the system
• If you You can't log in because you entered the wrong password. Press Enter once more, then re-enter the correct password and press Enter.
Users who encounter this problem can fix the problem through Windows Update after entering the system.