So I just spilt coffee on my laptop and it went mostly all over the keyboard. I shut it off after the screen went off, managed to dry the outside of it using kitchen roll and I removed the battery and the power cable. I also opened it and turned it upside down to drain and dry out the inside etc.
After a few minutes, I plugged my power cable in (without the battery in) and the fan just started whizzing by itself. I hadn't even touched the power button.