Http://www.manualslib.com/......7-210.html
Switches the screen image among display devices connected to the system. For example, if a
monitor is connected to the computer,
monitor display to simultaneous display on both the computer and the monitor.
Most external monitors receive video information from the computer using the external VGA video
standard. The
fn+f4
hotkey can also alternate images among other devices that are receiving video
information from the computer.
Ai legat un monitor si ai apasat? Daca da, trebuie sa mearga. Daca nu merge ai ceva stricat la placa video. Oricum, cel mai probabil tu nu l-ai conectat la un monitor sau ceva.