gang. I am in a bit of a pickle.
I can only boot into GRUB RESCUE, even if I attempt to boot from a USB stick. And:
All the commands I have tried in GRUB RESCUE (i.e. "help" "halt" "reboot" "insmod" "sudo") only yield the repsonse "Unknown command 'xxxx'"
However, inputting "ls" does yield "(hd0) (hd0,msdos1)" etc.
I was dual-booting Xubuntu and Windows 7; this happened after I formatted the Windows 7 partition using Parted Magic to ntfs.
So, to recap: I can't (as far as I can tell) boot from USB; any attempt to boot lands me in GRUB RESCUE (or BIOS). No commands I have tried work in GRUB RESCUE.