Note that when using grub commands, spaces are important. In particular, a space is required after the commands root and setup (but before the first bracket) and no spaces should be used inside the brackets.

1) Boot from a Live CD
2) Open a terminal window or switch to a TTY and enter:

3) At the grub prompt, use the following command to determine where grub is installed:

4) Using the hard disk and partition given by the above, enter:

5) Then quit grub by typing quit, and reboot your machine.

If you need more information about the partitions on your disk, use:


Note that the partition numbers shown by fdisk begin at zero; grub however uses a zero-based index, so you'll need to subtract one from the number given by fdisk.