To boot from a CD, DVD, or USB device, make sure the device has priority in boot sequence over the hard drive.
Booting BIOS
The BIOS (Basic Input Output Subsystem) is a programmable chip that controls how information is transmitted to the various peripherals of the computer system. A typical method to access the BIOS settings screen is to press ESC, F1, F2, F8, or F10 during the boot sequence.
BIOS settings allow you to execute a boot sequence from a floppy disk drive, hard disk drive, CD-ROM drive, or external device. You can configure the order in which your computer searches for these physical devices for the boot sequence.
The first device in the order list has first boot priority. For example, to boot from a CD-ROM drive instead of a hard disk, place the CD-ROM drive before the hard disk in priority.
Before setting the boot priority of a USB device, plug the device into a USB port.
To specify the startup sequence:
Start the computer and press ESC, F1, F2, F8, or F10 at the initial startup screen. Depending on the BIOS manufacturer, a menu may appear.
Choose to enter BIOS setup. The BIOS Setup Utility page appears.
Use the arrow keys to select the BOOT tab. System devices appear in order of priority.
To prioritize the boot sequence of a CD or DVD drive on the hard drive, move it to the first position in the list.
To prioritize the boot sequence of a USB device over the hard drive, follow these steps:
Move the hard disk device to the top of the boot sequence list.
Expand the hard drive device to view all hard drives.
Move the USB device to the top of the hard drive list.
Save and exit the BIOS Setup Utility.
The computer will restart with the changed settings.
Some computer manufacturers allow you to select the device containing the boot sequence from a special device selection menu. The example below uses a Dell system board.
To set boot priority using a device selection menu:
When the computer begins to boot, after the manufacturer identification screen, press F12 several times. The device selection menu appears.
Use the up and down arrows to select a CD-ROM or USB flash drive.
To boot from the selected device, press ENTER.
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