Mac water damage, won't boot

So last night I spilt the smallest amount of water onto the arrow keys of my laptop. Followed procesure and turned it straight off etc. the charger when plugged in shows no light at all, however, the laptop repeatedly boots to a white screen and makes the chime noise and then goes black again, if charger is left in it does this until unplugged. I managed to boot it up fully just once and the fan was very very loud when doing so. Now it won't turn on at all. Posting here as Apple can't see it until Friday and wondered if anyone had an answer. It's under warranty and covered by my student insurance but obviously water damage isn't covered by Apple.

Thanks!