Rebel6974
GRUB> is not the command line prompt
You need to boot up to the sme server CD/DVD/USB media & run sme Linux from the boot media rather than from the inbuilt hard drive.
Follow the instructions here
https://wiki.contribs.org/Booting#Rescue_Mode_Help& then follow on screen prompts.
Then run the dd commands specified previously, making sure you have correctly identified & specified the location of your hard disk drive eg sda most probably if there is only one SATA drive connected.
After that you can reboot to the CD/DVD/USB media (sme server iso) & run the installer, & install to your "erased" hard disk.
Let us know if that works correctly.
You do not & should not format the drive seperately, the installer will do that.
You have to correctly issue the dd command referred to, which you have as yet not done, so do not try other things until you have done all the above correctly.
Alternatively:
IIRC delpart will also do the job.
It is an old DOS floppy disk utility
see
http://www.computing.net/answers/dos/where-to-download-old-dos-delpart/17960.htmlor
http://www.juliatexas.com/delpart/delpart.htm& copy it to a bootable USB drive/stick.
Then boot up to that USB, & run delpart to delete partition info etc on the connected hard disk drive.