First Boot Up problem

Hello,

I just finished assemblying my first computer

my Mobo is Asus m4n72-e
my processor is AMD Phenom II X4
my memory is corsair 2 gb (one pair)

i'm running window xp pro as my operating system

I turn it on and everything seems running fine. Fans run fine, LEDs run fine, it boots, but the issue is that i cant seem to get into Bios page.

it just goes straight to a screen where it says near the bottom, no keyboard found. this is the screen i think where it reads the memory.

i do hear one beep and then three short beeps.

if it reads the memories as 4 gb on the black screen that i get, that must mean that the memories and mobo are not fried or anything right?

it says at the bottom, the boot will close in 15 seconds if i dont go to set up page, but i cant cause keyboard shows as not found.

could it be a graphic card issue?

let me know if i need to fill in more details for you guys to answer my question.

Thank you.