sony vaio boot option

[pankaj.kg2]

Hi, i want to know how to select boot option in sony vaio laptop. On press power button a logo of vaio and in left bottom corner 'press<F12> for network boot' appears on the screen even when i press assist key, same things appears on the screen. plz tell me how to select boot option or go to bios setup.

 

[DarkEngine]

Press and hold F2 key, while F2 still pressed press the Power on. Keep holding F2 key until you see BIOS setting.