Is a good tested keyboard?
Confirmed the keyboard is working correctly in a different board.
Are you using the back panel on the board? Otherwise the problem could be related with the front panel header. Finally, try to load the latest drivers and BIOS form the Intel site: Note: make sure you use the correct drivers for the corresponding operating system (32 or 64 bit)
If the problem keeps going after that we may be facing an incompatibility problem or a hardware problem on the keyboard.