Thanks for the replies guys, sorry for not responding sooner. I sorted the RAID problem by plugging in a PS2 keyboard into the PS2 port I didn't think I had.
I don't know why I thought this mobo didn't have one but it does and works fine. It only has the one PS2 port, not one for KB and another for mouse. Felt a right prat when I realised it was hiding back there.
I still have the issue with the USB keyboard on startup. I have setup a dual boot and need to select which OS I want to run, if I plug my KB in when the question comes up about selecting OS it works and I can choose but if the KB is already plugged in then it doesn't recognise it.
I haven't checked which BIOS is in but I don't think I've updated it since the original install a year ago so I will do that and see what happens.