If the PC is not used for an extended period, it goes into a locked state.
When the PC is used again, a lock screen appears for security purposes and may be unlocked by using the following method.
From the lock screen, press any key on the keyboard or drag up while you click and hold the mouse button.
When the login window appears, enter the password and click [Enter].
(If no password is set, press the login button to immediately unlock the screen.)