Certainly have the refrigerant checked, but I have usually heard of that being a gradual loss of cooling, and not a sudden one.
You didn't mention fuses, so have you checked? Fuse 22 Underhood. Also Fuse 16 in the BCM, but that powers other things too, so probably not.
You should be able to hear or see the compressor clutch engage if you turn it on and off with the hood open.
There isn't much else you can check without a diagnostic scanner.
Sky NA 2007 Midnight Blue
Sky RL 2008 Carbon Flash - Naked