Cannot Turn on MacBook Pro

I have the same issue with my 2008 macbook pro a1260. I've replaced the adapter - no luck. shorting the power jumpers on the logic board doesn't power it up. Tested the voltage on the adapter = good. tested the volts where the magsafe port connects to the i/o board (the pins) = ok. but it won't do a thing. I'd hate to replace the i/o board when it's the logic board, and vise versa. Any better way to test each board?

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What color is the LED on the magsafe? Is the new magsafe 60w or 85w? What voltages are you reading?

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