Pruning the forum database.
My keyboard was not working at the grub menu. I could not select a different kernal using the up and down arrows (or anything at all). I had to go into "setup" (in my case f2) and set "usb emulation" to "ON". after that, my keyboard worked.
My Dull doesn't have any PS2 - at all. USB is the only option for kb - mouse, etc. The sad bit is, there's no setting in BIOS like is in yours.