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I recently replaced the LCD on a MacBook 13.3 white model. That went fine, however, I noticed that the trackpad no longer worked. It turned out that I broke the ribbon cable accidentally. I replaced the ribbon cable that goes from the keyboard to the logic board. When I powered on after the fix, the screen flashed once and the system went to what I can only describe as to power save mode, wit the front light fading in and out. I thought maybe I broke the inverter board somehow. I replaced it and it is still doing the same thing. Is it possible that the logic board just died on me, because I cannot figure this one out?