Screen is black when turned on

Hello,

I have a toshiba satellite a305-s6872 and I had spilled tea on it a while back and i had let it dry out but when i had tried to turn it on the screen was black so i had let it dry out more and like a week later I tried it out and it came on and it had done the logo screen in all then it when to the screen where it said start windows normaly n all so i clicked start windows noramly and it went back to the black screen and now i turned it off and turned it back on and now its back with the black screen it had started another time and had did the same thing what do you think could be wrong?