Lenovo ThinkPad P40 Yoga User Manual page 99

To change the startup sequence temporarily so that the computer starts from a desired drive, do the following:
1. Restart the computer. When the ThinkPad logo is displayed, press F12.
2. Select the device that you want the computer to start from.
Note: The Boot menu will be displayed if the computer cannot start from any devices, or the operating
system cannot be found.
The following table lists the Startup menu items. Default values are in boldface. The menu items might
change without notice. Depending on the model, the default value might vary.
Note: Some items are displayed on the menu only if the computer supports the corresponding features.
Table 5. Startup menu items
Menu item
Boot
Network Boot
UEFI/Legacy Boot
Selection
• USB CD
• USB FDD
• ATA HDD0
• USB HDD
• PCI LAN
• Both
• UEFI Only
• Legacy Only
UEFI/Legacy Boot Priority
• Legacy First
• UEFI First
CSM Support
• No
• Yes
Comments
Select the boot device when you
press the power button to turn on the
computer.
Select top priority of the Boot Priority
Order when waking from LAN.
Select system boot capability.
• Both: The system boots by the
following UEFI/Legacy Boot Priority
setting.
• UEFI Only: The system boots from
the UEFI enabled operating system.
• Legacy Only: The system boots from
any operating system other than the
UEFI enabled one.
Note: If you select UEFI Only, the
system cannot boot from the bootable
devices that do not have the UEFI
enabled operating system.
Compatibility Support Module (CSM) is
required for booting the legacy operating
system. If you select UEFI Only, CSM
Support will be selectable. For Both or
Legacy Only mode, CSM Support will
not be selectable.
Note: The Both and the CSM Support
selections are available when theOS
Optimized Defaults on the Restart
menu is set as Disabled, the UEFI
Only selection is available when theOS
Optimized Defaults on the Restart
menu is set as Enabled.
.
Chapter 6 Advanced configuration
83