I got a lesson on stupidity the other day. I placed my cup of tea on top of the speaker without checking it was properly seated, and it toppled off. My keyboard and mouse got splashed with hot tea, resulting in keyboard failure. Without the keybosrd I couldn't fully start my computer.
This morning I visited our local Argos shop and spent twenty pounds GB on a new wireless keyboard and mouse. Fortunately set-up was simple, and I am up and running again.
So beware where you place your cup of tea or coffee!