Antwoord op "MacBook Core Duo not working properly after internals were replaced"I know that my answer is a year late. I too had to replace my logic board on my 2006 Macbook Core Duo because my daughter spilled water over the computer. I replaced my core duo logic board with a core 2 duo logic board and everything works really well. The core 2 duo logic board was bought on ebay from an ebay trader called domkuk. Excellent service and the trader sent a free heat sink compatible with the new logic board. Your problem is a either a dud logic board, in which case i recommend domkuk, and/or you need to replace your top keyboard/trackpad panel (costs around $50).