mode, and emergency mode, where you can use your own knowledge to repair the system.
You might need to boot into one of these recovery modes for any of the following reasons:
You are unable to boot normally into Red Hat Linux (runlevel 3 or 5).
You are having hardware or software problems, and you want to get a few important files off of your system's hard drive.
You forgot the root password.
on your computer. They overwrite the Master Boot Record (MBR) that originally contained the GRUB or LILO boot loader. If the boot loader is overwritten in this manner, you will not be able to boot Red Hat Linux unless you can get into rescue mode and reconfigure the boot loader.
If the partition number of your / partition changes, the boot loader might not be able to find it to mount the partition. To fix this problem, boot in rescue mode and modify /boot/grub/grub.conf if you are using GRUB or /etc/lilo.conf if you are using LILO. You must also run the /sbin/lilo command anytime you modify the LILO configuration file.
This category includes a wide variety of different situations. Two examples include failing hard drives and specifying an invalid root device or kernel in the boot loader configuration file. If either of these occur, you might not be able to reboot into Red Hat Linux. However, if you boot into one of the system recovery modes, you might be able to resolve the problem or at least get copies of your most important files.
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