Can't CTRL+ALT+DEL to log in to WHS computer with any keyboard

[Korialstrasza]

It's really weird. I've tried several keyboards with both USB and P/S2 or whatever but once WHS boots, I cannot login. The computer recognizes the keyboard during boot and I can get into BIOS fine. But once WHS loads up, no more keyboard. I CAN use a mouse though.

To top it off, the dumb thing reboots itself 20 seconds after loading into WHS and doesn't login.

Any ideas? Weird issue!
Thanks guys