Damaged keyboard, external keyboard won’t work

My kids spilled milk on our MacBook Pro A1278.

this is not the first time. we had the keyboard replaced once already.

anyway, some of the keys no longer work, so we can’t log in.

I have plugged in two different usb keyboards both of which I know are not faulty, and they both behave in exactly the same way as the milk damaged MacBook keyboard! For example, the a,m and t keys don’t work on the laptop, and they dont work on the external keyboards either!

so I still can’t log in.

is it possible that I’ve set the keyboard into a weird mode when wiping it by pressing loads of keys together?

can anyone help?

many thanks,

john