The message says "Install Failed. OS X could not be installed on your computer. The installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance. Click Restart to restart your computer and try installing again." (for the sake of the search engine).
I've tried this install repeatedly and get the error every time. Can someone please help me with this? I've searched all over the forum and can't find an answer that isn't "your USB key is corrupt". I've made several USB keys -- they can't all be corrupt (I even re-downloaded Mountain Lion from the App Store to make sure it wasn't a bad download).