"Forbiden" sign when trying to install 3.1

I opened this new topic for those having this specific problem when trying to install 3.1
I created a Memorex flash following the instructions.
When I try to install it, I get a grey screen with a “forbiden” sign…a circle crossed by a bar…and that’s it.
Nothing installed.

This problem has been determined to be the result of copying the installer app to the hard drive, and running from there.

The install should be ran directly from the disk image, as the disk image contains vital information that is required for the install.

The instructions will be updated shortly.