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Some week ago I started having some problems with my pc, sometimes it just freezed not allowing me to do anything. I had to turn it off and on and sometimes do it a couple of time even at startup.

Now it does not start at all, grub is giving me error 18. I have found that a solution is to create a bootable partition in the first sector of the disk.
gparted does not recognize any partition, the window in which there would be my partitions is empty.
sudo fdisk -l does not output anything.
If I type sudo mount /dev/sda and then tab tab to autocomplete these are the devices coming out: sda sda1 sda2 sda5.
If I launch sudo mount -t ext3 /dev/sda1 disk I get the following error:

mount: wrong fs type, bad option, bad superblock on /dev/sda1,
   missing codepage or helper program, or other error
   In some cases useful info is found in syslog - try
   dmesg | tail  or so

dmesg outputs

[ 1831.974847] EXT3-fs: unable to read superblock

Do you know how to solve this issue? I'm not completely sure this is a software problem, should I try with a new hard disk?

share|improve this question
I think my hard disk is gone. :( – Alberto Zaccagni Mar 12 '10 at 9:55
did you try booting to a liveCD and running fsck on /dev/sda1? – quack quixote Mar 17 '10 at 5:14
@quack quixote: No, I haven't, that's something I discovered just yesterday when I got a similar problem on a usb disk... I'll try today, thank you. – Alberto Zaccagni May 21 '10 at 7:49

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