I've got the second system on which the squeeze installer does not work. This time it's a system with a Asus P6X58D-E board. The kernel appears to boot normally, but the USB keyboard is not recognized, key presses have no effect. Have you got any suggestions how to debug this and turn it into a meaningful installation report? Installing lenny and upgrading worked for me the last time. I'll see if it does the trick this time, too.