You cannot use this All-in-One PC as a pure display for an external source such as a PlayStation 5, as it does not have an HDMI input function for external devices that do not serve as a second display. The HDMI ports are usually intended for output to a second display. However, if you want to use an external device as a second display, it could work via the HDMI input function if it is available, which does not seem to be the case with this model.