can you control D out of it and go to single user mode?
if you can then run fsck to fix errors but if you can't then the address of the kernel file is incorrect.
you can press e to edit the grub menu, change hd0,0 to hd 1,0 or hd 0,1 etc, and try different locations for the img file like /boot/initrd.img-x-y-z etc...
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