HELP Error: Unknown Issue Grub Rescue

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http://www.linuxquestions.org – I just got Linux Mint installed the other day and when I turned on my laptop today I got this message. Quote: Error: Unknown Issue Grub Rescue I booted into a USB drive and ran the command "sudo fdisk -l" Quote: Disk /dev/sda: 640.1 GB, 640135028736 bytes 255 heads, 63 sectors/track, 77825 cylinders, total 1250263728 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0xfde6a7e7 Device Boot Start (HowTos)