Once screenshot Mac successes, a new PNG format image will show up on desktop, usually titled Screen Shot with shooting date. Then you may hear a sound like camera shutter.
Press the hot key of Command+Shift+3 at the same time. Make sure you have opened all the windows to capture and put them in the right locations. When you need to take screenshot for the whole screenshot of Mac, you can use hot key to achieve the files with several steps.
