The keyboard problem mentioned in the updated BIOS was to do with slow keyboard response, keys repeating etc. If you have a key that appear to be sticking I'd be careful with doing a full BIOS update with that keyboard connected (it only happened once to me, but a bad BIOS flash is not a nice feeling!).
I'd be tempted to look at the device manager in Windows to see if it says anything about the keyboard, to see that it is detected or if there is some message. If it isn't listed I'd be tempted to check the cable is in fully and locked down. At least with that laptop replacement keyboards seem to be widely available on Ebay and cheap too