Dell Precision Tower 3420 Owner's Manual

Boot Sequence allows you to bypass the System Setup‐defined boot device order and boot directly to a specific device (for example: optical drive or hard drive). During the Power-on Self Test (POST), when the Dell logo appears, you can:

• Access System Setup by pressing F2 key
• Bring up the one-time boot menu by pressing F12 key

The one-time boot menu displays the devices that you can boot from including the diagnostic option. The boot-menu options are:

Table 1. Boot SequenceThis section explains you Boot Sequence.

Option	Description
Legacy Boot	ST2000DM001–1ER164 CD/DVD/CD-RW Drive Onboard NIC
UEFI Boot	Windows Boot Manager
Other options	BIOS Setup BIOS Flash Update Diagnostics Intel (R) Management Engine BIOS Extension (MEBx) Change Boot Mode Settings

The boot sequence screen also displays the option to access the System Setup screen.