Strange locking up at boot

I upgraded my mobo, processor and ram today, and i'm getting a strange problem when I try to boot. Everything worked fine with my old build.

Old Components:

Athlon 64 X2 3800+
Asus A8N-SLI Premium
2GB OCZ Platinum DDR 400 (2x 1GB)

New Components:

Intel Core 2 E6750
Gigabyte P35-DS3P
4GB OCZ DDR2 800 (2x 2GB)

Transfered Components:
LG DVDRW
2x 250GB Seagate SATAII drives
eVGA 8800GTS
Ultra 500W PSU

The new setup posts fine, and I can get into the bios no problem. They keyboard is responsive in the bios, and everything seems to be ok.

When i go beyond the post and try to boot (off CD, hard drive, doesnt matter what device) the keyboard becomes unresponsive and the system locks. For example, when booting off an XP install disk, i get the "press any key to boot from cd....." I can watch the 5 dots go across, but cant press a key to continue the boot off CD. Ive tried 2 keyboards (both USB)

When booting off the hard drive (nothing on it, was a raid setup on a different controller) I get sytem disk error, press ctrl alt del to restart, but the system is locked up again.

I have tried with only 1 stick of ram (both sticks one at a time) and only 1 hard drive plugged in (to make sure it wasnt a power issue).

The other strange thing, when i get to the boot from CD, there is still the remainder of the bios post listing pci devices, irqs, etc on the screen. When the system locks, a few of the letters and numbers that are printed on the screen dissapear. It is only 3 or 4, and always the same letters and numbers dissapearing.

Anyone have any ideas?

I tried with nothing else plugged into the usb, same thing. I just found a copy of memtest, I'll let it go overnight and see what I find in the morning.

I think XP does not load the USB drivers till later, so the keyboard does not work. I find that for a fresh install of XP a PS2 keyboard is needed (Though once installed there is no problem)
JB

Wow... I cant believe I missed that one with the amount of time I spent in the bios. USB keyboard support is disabled by default on this board for anyone with similar issues, enable it and all is good.