Samsung NP900X3E-A03US manual Changing the Boot Priority, Select the Boot menu in the Bios Setup

Changing the Boot Priority	Settings and Upgrade	90
	Chapter 4.
As an example, the procedures to change the highest boot priority	↓
	Press the down key ( ) to move to the SATA HDD item and
device to the hard disk drive are described below.	3 press the F6 key to move up to the top item.

	The screen images and terms may differ from actual product
	depending on the computer model and driver version.
1	Select the Boot menu in the BIOS Setup.
2	Press <Enter> on the Boot Device Priority item.

	Boot Menu
[Boot Priority Order]
1. SATA CD	: XXXXXXXXXXXX
2. SATA HDD : XXXXXXXXXXXX
3. USB CD	: N/A
4. USB FDD	: N/A
5. USB HDD	: N/A
6. NETWORK	: N/A

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4	Press the F10 key to save the settings and exit Setup.
	The highest boot priority device is now set to the Hard Drive.

If you need to boot to DOS using a USB device, enter the BIOS Setup, select the Advanced menu and set the Fast BIOS Mode item to Disabled.