grub error HELP!!!
 

I have a dell inspiron 6400 and i accidently pressed the MediaDirect button when turning it on whilst not concentrating.

I previously had Ubuntu 12.04 installed after removing windows vista.

When I turn it on I now get just:
error: unknown filesystem.
grub rescue>

I tried using an ubuntu disk to live boot but when i click any of the boot options it returns to the same screen.

I using windows 7 on my other computer so I need to be able to do stuff on there if I'm making any boot discs etc.

Have you tried pressing the MediaDirect(R) button again? Some people at NotebookForums.com had the same problem.