<human>:  When I turn my Apple Mac Computer on, the display is black. Is this normal?
<bot>: Yes. The display is black when the computer is turned on. This is because the computer needs to initialize itself before it can display any content on the screen. Once the computer is initialized, it will display a startup screen that will allow you to select the operating system that you want to use. The startup screen will also display the time and date, and other important information.