Lenovo ThinkPad Helix S230U User Manual page 90

2. Turn on the computer, then, while the ThinkPad logo is displayed at the lower-left of the screen,
press F12.
3. Select the device you want to start first.
Note: The Boot menu will be displayed when the system cannot boot from any device or the operating
system cannot be found.
The following table shows the contents of the Startup menu items.
Notes:
• Default values are in boldface.
• On each submenu, press Enter to show selectable options and select a desired option.
• Some items are displayed on the menu only if the computer supports the corresponding features.
The following table lists the Startup menu items.
Table 4. Startup menu items
Menu item
Boot
Network Boot
UEFI/Legacy Boot
UEFI/Legacy Boot Priority
CSM Support
Boot Mode
Option Key Display
76
User Guide
Selection
• USB CD
• USB FDD
• ATA HDD0
• ATA HDD1
• ATA HDD2
• USB HDD
• PCI LAN
• UEFI Only
• Both
• Legacy Only
• UEFI First
• Legacy First
• No
• Yes
• Quick
• Diagnostics
• Disabled
• Enabled
Comments
Refer to "Changing the startup
sequence" on page 75.
Select top priority of the Boot Priority
Order when waking from LAN.
Enable the UEFI/Legacy boot.
Select priority of boot option between
UEFI and Legacy.
Compatibility Support Module (CSM) is
defined in UEFI spec.
The Quick boot is intended to boot the
operating system as soon as possible
by reducing the POST elapsed time. The
Diagnostics boot is to be used for the
problem determination by performing
tests of the devices.
If you select Disabled, then the message
"To interrupt normal startup, press Enter"
is not displayed during the POST.