I had Ubuntu on my hard drive and tried to install Arch Linux. Things got messy and I now have an unstable, unbootable machine. I feel the installation failed because there were remains of Ubuntu. I'd like to wipe the hard drive and start over from scratch; without anything on there. How do I do this? I have several partitions made in a desperate attempt to make it all work. So I'd like to remove all partitions and any other information that's on the drive. 

I can not start any OS, but I can boot with the Live USB of Arch Linux...