MSI K8T Neo-V / Keyboard not found ..... HELP! Please!

First, I'm not sure if this should be in this forum, or the MSI board forum. I posted it here because this forum seems to get more traffic, which will hopefully equate to me getting a solution quicker  

Here are my specs:

Motherboard: K8T Neo-V
CPU: AMD Athlon64 3100+
RAM: Kingston 512 MB PC3200
AGP: ATI Radeon 9700 Pro
HD: Maxtor SATA 80 GB Drive
PSU: Xion 400 watt (14A Max on +12V1, 15A Max on +12V2)

What I get upon booting:
PS2 Keyboard Not Found
CMOS Checksum Bad
Press F1 to load SETUP
Press F10 to load default values and continue


I don't know what the problem could be. Needless to say, there's nothing I'm able to do without a keyboard.

I have tried booting with everything in the case, as well as on a piece of cardboard (the way it is now). I still get the same error.

I have tried four keyboards. I used two OLD PS2 Keyboards (P1 era), 1 newer PS2 Keyboard (although unsure of age), and 1 USB Keyboard with a USB-to-PS/2 Convertor. No success. All four keyboards are functional in my two other PC's.

Any ideas? I have never tried an MSI board before; I'm thinking that may have been a huge mistake. I've never had these problems before. Is it RMA time?