I am absolutely new in Linux and I have faced the same problem as binoynicolas.
I am trying to install Fedora, but my USB keyboard is not responding. It works properly when I enter BIOS and so on, also when choosing the bootable device and on the first screen, when asking me about the mode of installation. After initializing the installation, it is just not responding and I cannot go further (e.g. choose to test the media).
My computer does not have PS/2.
Please, help me :-)