Hi, A couple years ago a friend gave me a non-working MacBook Pro 13" Mid 2009. If I remember correctly she said she spilt some water or coke on the keyboard. The laptop kept running as usual for a couple days then stopped working for good. Just recently, I decided to charge it and try to power it up. To my surprise it made the apple sound when you first boot a macbook and seemed to be running, but the screen remained black. Anyone I talked to and everything I read suggested the logic board needed to be replaced. Before buying a new one, I decided to try removing the logic board and clean it by applying some isopropyl alcohol (99%) with a toothbrush. I also removed the heat sink and after everything was dry, re-applied the thermal compound (Arctic MX-4). I followed procedures very carefully to ensure I was doing everything correctly. After putting everything back together, I tried booting the laptop to see if the screen would light up; however, nothing happened - it now no longer boots at all. I tried resetting the system management controller but still no luck. I'm now a bit skeptical to buy a new logic board. I figured even if cleaning the old logic board with alcohol didn't work, it would still boot up with a black screen like it had before. Does anyone know where I might of went wrong or what might have caused this? Would putting too little or too much thermal compound for the heat sink straight up cause the computer to stop booting when it was booting just prior to taking the logic board out? Any help or advice would be much appreciated. Thank you.