Computer doesn't turn on.

MacBook Pro 15" Core 2 Duo Model A1260 Early '08

Computer does not power up at all. I have replaced the complete top case including the connecting ribon. I have also replaced the logic board and the dc power board. No change. The 85 watt cord lights up green with the battery out. Smc bypass does nothing.

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Have you tried starting thew system up via the Power Pads?

Power Button pads on logic board

With the top case removed, the top case ribbon cable disconnected. Instead of having to reconnect the top case to turn on the system, there are two pads on the logic board that can be shorted across (with a tool like a flat blade screwdriver) to act as the power button.

These pads are located near the lower edge of the logic board between the RAM slots and the upper left corner of the optical drive. The two pads are separated with a horizontal white line and bracketed by another line that leads to the marker “PWR.”

Are you able to start the system up?

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