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Chapter 6. Booting the Installer

6.1. The Boot Menu
6.2. Installing from a Different Source
6.3. Booting from the Network using PXE

Important — Booting Older Systems from CD or DVD Media

The CD and DVD media include boot catalog entries for both BIOS and UEFI firmware interfaces. This allows you to boot systems based on either firmware interface from the same CD or DVD. However, some systems with very old BIOS implementations cannot handle media with more than one boot catalog entry. These systems will not boot from the CD or DVD and you must instead boot them from USB or PXE.
Note that the boot configurations of UEFI and BIOS differ significantly from each other. Therefore, the installed system must boot using the same firmware that was used during installation. You cannot install the operating system on a system that uses BIOS and then boot this installation on a system that uses UEFI.
To start the installation program from a Red Hat Enterprise Linux CD, DVD, or minimal boot media, follow this procedure:
  1. Disconnect any external FireWire or USB disks that you do not need for installation. Refer to Section 4.3.3, “ FireWire and USB Disks ” for more information.
  2. Power on your computer system.
  3. Insert the media in your computer.
  4. Power off your computer with the boot media still inside.
  5. Power on your computer system.
You might need to press a specific key or combination of keys to boot from the media. On most computers, a message appears briefly on the screen very soon after you turn on the computer. Typically, it is worded something like Press F10 to select boot device, although the specific wording and the key that you must press varies widely from computer to computer. Consult the documentation for your computer or motherboard, or seek support from the hardware manufacturer or vendor. On Apple computers, the C key boots the system from the DVD drive. On older Apple hardware you might need to press Cmd+Opt+Shift+Del to boot from the DVD drive.
If your computer does not allow you to select a boot device as it starts up, you might need to configure your system's Basic Input/Output System (BIOS) to boot from the media.
To change your BIOS settings on an x86, AMD64, or Intel® 64 system, watch the instructions provided on your display when your computer first boots. A line of text appears, telling you which key to press to enter the BIOS settings.
Once you have entered your BIOS setup program, find the section where you can alter your boot sequence. The default is often C, A or A, C (depending on whether you boot from your hard drive [C] or a diskette drive [A]). Change this sequence so that the CD-ROM is first in your boot order and that C or A (whichever is your typical boot default) is second. This instructs the computer to first look at the CD-ROM drive for bootable media; if it does not find bootable media on the CD-ROM drive, it then checks your hard drive or diskette drive.
Save your changes before exiting the BIOS. For more information, refer to the documentation that came with your system.

Note — Aborting the Installation

To abort the installation, either press Ctrl +Alt+Del or power off your computer with the power switch. You may abort the installation process without consequence at any time prior to selecting Write changes to disk on the Write partitioning to disk screen. Fedora makes no permanent changes to your computer until that point. Please be aware that stopping the installation after partitioning has begun can leave your computer unusable.

6.1. The Boot Menu

The boot media displays a graphical boot menu with several options. If no key is hit within 60 seconds, the default boot option runs. To choose the default, either wait for the timer to run out or hit Enter on the keyboard. To select a different option than the default, use the arrow keys on your keyboard, and hit Enter when the correct option is highlighted. If you want to customize the boot options for a particular option, press the Tab key.
When using Fedora Live media, press any key during the initial boot countdown to bring up the Boot Options menu.
The boot screen
The boot screen
Figure 6.1. The boot screen

For a listing and explanation of common boot options, refer to Chapter 9, Boot Options.
If you boot the DVD, rescue CD, or minimal boot media, the boot menu options are:
Install or upgrade an existing system
This option is the default. Choose this option to install Fedora onto your computer system using the graphical installation program.
Install system with basic video driver
This option allows you to install Fedora in graphical mode even if the installation program is unable to load the correct driver for your video card. If your screen appears distorted or goes blank when using the the Install or upgrade an existing system option, restart your computer and try this option instead.
Rescue installed system
Choose this option to repair a problem with your installed Fedora system that prevents you from booting normally. Although Fedora is an exceptionally stable computing platform, it is still possible for occasional problems to occur that prevent booting. The rescue environment contains utility programs that allow you fix a wide variety of these problems.
Boot from local drive
This option boots the system from the first installed disk. If you booted this disc accidentally, use this option to boot from the hard disk immediately without starting the installer.