[ubuntu] Keyboard/mouse doesn't work during installation

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http://ubuntuforums.org – Hello, When I try to install Ubuntu 12.04 AND 12.10 on my old computer, the keyboard and mouse stop working. I know that they are working because when I am in BIOS, the keyboard works. I already try to do everything: • Installed a external keyboard (this keyboards is working on the BIOS too) • Try to use another copy of Ubuntu 12.04 AND 12.10 • Reconnect the keyboard cable. • Try to install Ubuntu with a bootable pen-drive But the problem persists. What can I do? (Hardware)