How to Call Boot Menu Screen
From Novicorp WinToFlash [The Bootable USB Creator] WiKi
To enter BIOS boot selection screen you should press a specific key during POST.
This page lists some keys and combinations, divided by computer, BIOS or motherboard manufacture to help you.
Acer
Esc F9 F12
Asrock
F11
Asus
Esc F8
Compaс
Esc F9
Dell
ECS F11 F12
Fujitsu Siemens
F12
Gigabyte
F12
HP
Esc F9
Intel
F10
Lenovo
F12
MSI (Micro-Star)
F11
Packard Bell
F8
Samsung
Esc
Sony Vaio
F11 ASSIST
Toshiba
F12