Help: grub rescue??'

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http://askubuntu.com – My Ubuntu 10.10 system suddenly froze/crashed for no reason and I had to hard reboot my computer. Surprisingly it doesn't load anymore and stay stuck on a grub rescue prompt after an "unknown filesystem" message. That was enough clues to start googling for solutions. a simple grub rescue > ls show me all partitions on hard drives : (hd0) (hd0,5) (hd0,1) (hd1) (hd1,1) (hd1,2) (fd0) According to all answers that I've already found, next logical step is to ls again the specific partition that contains the kernel, which is (hd0,1) in my case : grub rescue > ls (hd0,1)/ unknown filesystem So her (HowTos)