IF NO IDEAS

command + Shift + 3   (you will found the image that you capture on the desktop with the name "Screen Shot")

Shift + Fn + F11   (If your functions key controls the hardware) Shift + F11 (If your function keys bahaves as normal functions keys) If you want take a screenshot of the active window jus add the Alt key. Alt + Shift + Fn + F11 (If your functions key controls the hardware) Alt + Shift + F11 (If your function keys bahaves as normal functions keys)