windows 7 - New mechanical keyboard not working

I've got a new "Kingston KyperX Allow FPS" keyboard, and I have plugged it in, but it's not working

OS: Win7, sp1.

• Media keys work (volume up/down etc)


• changing LED modes work


• caps / num lock doesn't work


• all other typing does not work.

If I plug another keyboard in at the same time (this second keyboard works fine), and if I press capslock on this keyboard the capslock light turns on on the kingston keyboard.

Any ideas? Anyone had anything similar? or is it just busted...

Thanks

EDIT: Keyboard works in BIOS, but not in windows.