Caps lock + letters A to l not working on mac USB keyboard I am on the verge on snapping my brand new 27" iMacs keyboard. It's the latest USB model. I can't even login to my system because my password contains the letters I have said are not working. All was working fine yesterday. 

I can confirm caps lock and letters A to L are not responding. Every other key works as expected.

Has anyone got any ideas before the keyboard becomes two and the iMac goes out the window?
Seems like a hardware problem you should be able to replace it under the warranty if no liquid was spilled over it.