keyboard works in BIOS & GRUB but not during boot

[scar]

>>> Then, try to add a new line "insmod usb_keyboard" to the beginning of
>>> the grub entry manually before pressing 'enter'.
>>
>> when i do this, the machine just instantly reboots
> 
> Okay sorry, I don't know what else then.
> Good luck, regards - Goh Lip

i don't know much about modules, but how come i can't find anything that
mentions usb_keyboard in /lib/modules/2.6.32-33-generic

$ cd /lib/modules/2.6.32-33-generic
$ grep -R usb_keyboard *
$

are you use 'usb_keyboard' is right?