First things first:
- I cannot use a CD; it must be a USB drive
I've downloaded the minimal iso for CentOS 6.4, and copied it to a USB drive (8gb), which works fine for installation on Parallels virtual machines. I tried to install it on a server with an empty hard drive, but it fails to boot, with a black screen and white blinking underscore. I just now wiped the drive, and it worked with CentOS before.