On Sun, Feb 28, 2010 at 07:47:52PM -0800, uvishere wrote:
> This is the output of fdisk -l:
> 
> Disk /dev/sda: 250.0 GB, 250059350016 bytes
> 255 heads, 63 sectors/track, 30401 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Disk identifier: 0xa7b7a7b7
> 
>    Device Boot      Start         End      Blocks   Id  System
> 
> and these r the entries of /boot/grub/menu.lst:
> 
> # menu.lst - See: grub(8), info grub, update-grub(8)
> #            grub-install(8), grub-floppy(8),
> #            grub-md5-crypt, /usr/share/doc/grub
> #            and /usr/share/doc/grub-doc/.
> 
> ## default num
> # Set the default entry to the entry number NUM. Numbering starts from
> 0, and
> # the entry number 0 is the default if the command is not used.
> #
> # You can specify 'saved' instead of a number. In this case, the
> default entry
> # is the entry saved with the command 'savedefault'.
> # WARNING: If you are using dmraid do not use 'savedefault' or your
> # array will desync and will not let you boot your system.
> default               0
> 
> ## timeout sec
> # Set a timeout, in SEC seconds, before automatically booting the
> default entry
> # (normally the first entry defined).
> timeout               2
> 
> ## hiddenmenu
> # Hides the menu by default (press ESC to see the menu)
> hiddenmenu
> 
> # Pretty colours
> #color cyan/blue white/blue
> 
> ## password ['--md5'] passwd
> # If used in the first section of a menu file, disable all interactive
> editing
> # control (menu entry editor and command-line)  and entries protected
> by the
> # command 'lock'
> # e.g. password topsecret
> ## password --md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
> # password topsecret
> 
> #
> # examples
> #
> # title               Windows 95/98/NT/2000
> # root                (hd0,0)
> # makeactive
> # chainloader +1
> #
> # title               Linux
> # root                (hd0,1)
> # kernel      /vmlinuz root=/dev/hda2 ro
> #
> 
> #
> # Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST
> 
> ### BEGIN AUTOMAGIC KERNELS LIST
> ## lines between the AUTOMAGIC KERNELS LIST markers will be modified
> ## by the debian update-grub script except for the default options
> below
> 
> ## DO NOT UNCOMMENT THEM, Just edit them to your needs
> 
> ## ## Start Default Options ##
> ## default kernel options
> ## default kernel options for automagic boot options
> ## If you want special options for specific kernels use kopt_x_y_z
> ## where x.y.z is kernel version. Minor versions can be omitted.
> ## e.g. kopt=root=/dev/hda1 ro
> ##      kopt_2_6_8=root=/dev/hdc1 ro
> ##      kopt_2_6_8_2_686=root=/dev/hdc2 ro
> # kopt=root=UUID=4e2cf1ee-b52e-4a8d-8834-0f92b154ab44 ro
> 
> ## default grub root device
> ## e.g. groot=(hd0,0)
> # groot=4e2cf1ee-b52e-4a8d-8834-0f92b154ab44
> 
> ## should update-grub create alternative automagic boot options
> ## e.g. alternative=true
> ##      alternative=false
> # alternative=true
> 
> ## should update-grub lock alternative automagic boot options
> ## e.g. lockalternative=true
> ##      lockalternative=false
> # lockalternative=false
> 
> ## additional options to use with the default boot option, but not
> with the
> ## alternatives
> ## e.g. defoptions=vga=791 resume=/dev/hda5
> # defoptions=quiet splash
> 
> ## should update-grub lock old automagic boot options
> ## e.g. lockold=false
> ##      lockold=true
> # lockold=false
> 
> ## Xen hypervisor options to use with the default Xen boot option
> # xenhopt=
> 
> ## Xen Linux kernel options to use with the default Xen boot option
> # xenkopt=console=tty0
> 
> ## altoption boot targets option
> ## multiple altoptions lines are allowed
> ## e.g. altoptions=(extra menu suffix) extra boot options
> ##      altoptions=(recovery) single
> # altoptions=(recovery mode) single
> 
> ## controls how many kernels should be put into the menu.lst
> ## only counts the first occurence of a kernel, not the
> ## alternative kernel options
> ## e.g. howmany=all
> ##      howmany=7
> # howmany=all
> 
> ## specify if running in Xen domU or have grub detect automatically
> ## update-grub will ignore non-xen kernels when running in domU and
> vice versa
> ## e.g. indomU=detect
> ##      indomU=true
> ##      indomU=false
> # indomU=detect
> 
> ## should update-grub create memtest86 boot option
> ## e.g. memtest86=true
> ##      memtest86=false
> # memtest86=true
> 
> ## should update-grub adjust the value of the default booted system
> ## can be true or false
> # updatedefaultentry=false
> 
> ## should update-grub add savedefault to the default options
> ## can be true or false
> # savedefault=false
> 
> ## ## End Default Options ##
> 
> title         Ubuntu 9.04, kernel 2.6.28-17-generic
> uuid          4e2cf1ee-b52e-4a8d-8834-0f92b154ab44
> kernel                /boot/vmlinuz-2.6.28-17-generic root=UUID=4e2cf1ee-
> b52e-4a8d-8834-0f92b154ab44 ro quiet splash
> initrd                /boot/initrd.img-2.6.28-17-generic
> quiet
> 
> title         Ubuntu 9.04, kernel 2.6.28-17-generic (recovery mode)
> uuid          4e2cf1ee-b52e-4a8d-8834-0f92b154ab44
> kernel                /boot/vmlinuz-2.6.28-17-generic root=UUID=4e2cf1ee-
> b52e-4a8d-8834-0f92b154ab44 ro  single
> initrd                /boot/initrd.img-2.6.28-17-generic
> 
> title         Ubuntu 9.04, kernel 2.6.28-13-generic
> uuid          4e2cf1ee-b52e-4a8d-8834-0f92b154ab44
> kernel                /boot/vmlinuz-2.6.28-13-generic root=UUID=4e2cf1ee-
> b52e-4a8d-8834-0f92b154ab44 ro quiet splash
> initrd                /boot/initrd.img-2.6.28-13-generic
> quiet
> 
> title         Ubuntu 9.04, kernel 2.6.28-13-generic (recovery mode)
> uuid          4e2cf1ee-b52e-4a8d-8834-0f92b154ab44
> kernel                /boot/vmlinuz-2.6.28-13-generic root=UUID=4e2cf1ee-
> b52e-4a8d-8834-0f92b154ab44 ro  single
> initrd                /boot/initrd.img-2.6.28-13-generic
> 
> title         Ubuntu 9.04, kernel 2.6.28-11-generic
> uuid          4e2cf1ee-b52e-4a8d-8834-0f92b154ab44
> kernel                /boot/vmlinuz-2.6.28-11-generic root=UUID=4e2cf1ee-
> b52e-4a8d-8834-0f92b154ab44 ro quiet splash
> initrd                /boot/initrd.img-2.6.28-11-generic
> quiet
> 
> title         Ubuntu 9.04, kernel 2.6.28-11-generic (recovery mode)
> uuid          4e2cf1ee-b52e-4a8d-8834-0f92b154ab44
> kernel                /boot/vmlinuz-2.6.28-11-generic root=UUID=4e2cf1ee-
> b52e-4a8d-8834-0f92b154ab44 ro  single
> initrd                /boot/initrd.img-2.6.28-11-generic
> 
> title         Ubuntu 9.04, memtest86+
> uuid          4e2cf1ee-b52e-4a8d-8834-0f92b154ab44
> kernel                /boot/memtest86+.bin
> quiet
> 
> 
> ### END DEBIAN AUTOMAGIC KERNELS LIST
> 
> now what is to be compared?? please give me the solution.
> 
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Well, that output from fdisk shows you have an empty partition table.
This doesn't explain how grub can load and even load a configuration -
do you have your boot partition on a separate disk?  If not, I'm
inclined to guess a driver problem.  You might try these instructions
using a Knoppix disk (or similar)

http://ftp.ibiblio.org/pub/linux/docs/HOWTO/other-formats/html_single/Partition-Rescue.html

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