本文提供了解决GRUB丢失导致系统引导失败的方法，包括如何使用grub命令行模式修复，并通过特定步骤恢复Windows和Red Hat Enterprise Linux Server的引导功能。
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You do not have a /boot partition. This means that
# all kernel and initrd paths are relative to /, eg.
# root (hd0,2)
# kernel /boot/vmlinuz-version ro root=/dev/sda3
# initrd /boot/initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,2)/boot/grub/splash.xpm.gz
#hiddenmenu
title Red Hat Enterprise Linux Server (2.6.18-194.el5PAE)
root (hd0,2) //指定/boot所在的分区
kernel /boot/vmlinuz-2.6.18-194.el5PAE ro root=LABEL=/ rhgb quiet crashkernel=128M@16M
initrd /boot/initrd-2.6.18-194.el5PAE.img
title WIN7
rootnoverify (hd0,0)
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You do not have a /boot partition. This means that
# all kernel and initrd paths are relative to /, eg.
# root (hd0,2)
# kernel /boot/vmlinuz-version ro root=/dev/sda3
# initrd /boot/initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,2)/boot/grub/splash.xpm.gz
#hiddenmenu
title Red Hat Enterprise Linux Server (2.6.18-194.el5PAE)
root (hd0,2) //指定/boot所在的分区
kernel /boot/vmlinuz-2.6.18-194.el5PAE ro root=LABEL=/ rhgb quiet crashkernel=128M@16M
initrd /boot/initrd-2.6.18-194.el5PAE.img
title WIN7
rootnoverify (hd0,0)
chainloader +1
补充：
开机时按下ctrl+c进入grub命令行模式
由于重新安装windows或其它未知原因而导致的GRUB丢失：
root (hd0,6) //指定/boot所位于的分区
setup (hd0) //写入MBR
quit
重新引导就会再次出现GRUB的菜单或命令行的提示符了；
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