After the screen turns black, are you still able to see or move the mouse pointer?
Does the screen come back if you press Ctrl + Alt + Delete or Windows + Ctrl + Shift + B?
Press Ctrl + Alt + Delete and select Task Manager. If Task Manager opens, click File > Run new task, type explorer.exe, and press Enter. Shut down the laptop completely, unplug all external devices (USB drives, external monitor, etc.), then turn it back on and try signing in again.