I have a Asus P4P800 SE and the PS/2 ports do not work, there is a small amount of damage on the corner next to them, is there supposed to be a small component there and how can I access the bios without a PS/2 keyboard as my USB keyboard does not work untill windows (vista) kicks in

No, there is nothing on the corner where you say it is damaged, i have one of these boards and still have the manual, the ps/2 sockets might have come away from the board and may need to be resoldered if anything. I am curruntly using a usb keyboard on my pc, and using vista, the keyboard automatically kicks it when post screen appears, what make of keyboard do you have? I suggest getting hold of another usb keyboard, they should be generic as soon as the computer posts. There is nothing in the manual that says there is a setting to change keyboards from ps/2 to usb. They should be generic.
post back if you need more help.