Asus P5NT WS motherboard

Hello,

I have the subject motherboard. My problem is that I cannot get my USB
keyboard to work in the motherboard's bios. I have to use a ps2 adapter to
obtain use the keyboard in the bios. There is no problems with USB devices
and if I boot normally I can use the keyboard as a USB device in Windows
without any problems. I heard that nVidia chipset motherboards have hidden
bios features so perhaps I am missing something here

Anyone point me in the right direction to get my usb keyboard to work in the
bios?

Thanks,
Shane