P5K Deluxe error: no keyboard detected? HELP!

Hey guys, i built my current gaming PC a little over 2 years and it's always served me very well, but lately when i boot up (before getting into windows) the mobo tells me it cannot detect a keyboard and i am unable to access bios. However, once i get into windows, the keyboard works 100% fine. The keyboard is just a generic $15 microsoft PS/2 keyboard. Has anyone heard of a problem like this before? Could it be my motherboard is just getting old? Is something wrong with my RAM even though i tested for 24 hours with memtest when i built?

Thanks for the Help!

My Rig:
ASUS P5K Deluxe wifi-ap
Core 2 E4300
4x 1Gb Patriot Memory
Sapphire 4870 512Mb
Windows XP SP3

Yes, my CPU was oc-ed to 3.0Ghz when i built. I had it stable for 8 hours in prime95 and all that good stuff, but recently it tells me my overclock has failed, which i figure is just a product of my CPU degrading over time. However, i don't know how i could update my mobo's bios without a working keyboard....