Using a Mac computer your mouse becomes lost or you have an application that is open (based on the black dot underneath its icon), but you cannot find the application. Your computer thinks the application is open, but it is not. What should you do?
Is your laptop connected to another monitor? If an HDMI cable is connected to the laptop and that monitor is off or hidden, you may not realize there is a dual-monitor environment. A wireless projector could also cause this problem. You may mistakenly think the laptop monitor is all there is. The application or mouse icon may be hovering in the monitor that is off or physically hidden.
To browse Mac products, see this link.