I have a new Gigabyte 970A-D3 with an AMD Phenom II CPU and I'm trying to install an OS. This is not my first rodeo installing Linux.
I've tried booting to the live OS for Ubuntu 12.10 and Lubuntu 12.10 and after it loads the OS, the mouse and keyboard do not respond. The USB mouse and keyboard work fine inside the BIOS and during language selection for the Live CDs. I've tried different USB ports, still no good.
This is a UEFI motherboard, but I'm not booting to UEFI mode. Are there any BIOS settings I can look at that might help?

Note: Legacy USB support is enabled. I have tried different mice and keyboards. When I get to the screen that allows me to either Try or Install Ubuntu, the keyboard works fine. A PS2 mouse works.