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One linux machine suddenly shows insert boot disk and press enter. So I think grub may be corrupted, as the hdd is detected in the BIOS. So now I insert the dvd and goto rescue mode. Now it shows the harddisk is uninitialized and wipe out all data iif initialized.
There's a big difference between a corrupt grub and a disk showing as not initialized. If you think your grub is corrupt then you can try to reinstall it from the LiveCD by mounting the disk, /dev and /proc and enter in a chroot environment to execute grub-install, like this:
mount /dev/<yourdisk> /adirectory_to_mount_your_disk (find out with fdisk -l)
mount --bind /dev /adirectory_to_mount_your_disk/dev
mount --bind /proc /adirectory_to_mount_your_disk/proc
grub-install --recheck /dev/<yourdisk>
If that fails, then try to mount the disk normally when booted from LiveCD and copy the contents you need to USB/NFS/... and reinstall. When you're unable to mount the disk then you might have a hardware failure.