Quote:
21 : Selected disk does not exist
This error is returned if the device part of a device- or full file name refers to a disk or BIOS device that is not present or not recognized by the BIOS in the system.
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http://www.gnu.org/software/grub/man...roubleshooting
The missing disk could be the disk that contains /boot/grub/menu.lst. Or it could be the disk where the kernel is located or the disk where initrd is located.
You could boot a liveCD and give us a listing of /boot/grub/menu.lst if possible.
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Steve Stites