A.6.1. Loading the Memory (RAM) Testing Mode
Faults in memory modules may cause your system to freeze or
crash unpredictably. In some cases, memory faults may only cause
errors with particular combinations of software. For this
reason, you should test the memory of a computer before you
install Fedora for the first time, even if it has previously run
other operating systems.
To boot your computer in
memory testing mode, enter
prompt. The first test starts immediately. By default,
memtest86 carries out a total of ten tests.
To halt the tests and reboot your computer, enter
at any time.
A.6.2. Booting Your Computer with the Rescue Mode
You may boot a command-line Linux system from either a
rescue disc or the first installation disc, without installing
Fedora on the computer. This enables you to use the utilities and
functions of a running Linux system to modify or repair systems
that are already installed on your computer.
The rescue disc starts the rescue mode system by default. To
load the rescue system with the first installation disc, enter:
Specify the language, keyboard layout and network settings for
the rescue system with the screens that follow. The final setup
screen configures access to the existing system on your
By default, rescue mode attaches an existing operating system to
the rescue system under the directory