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No power - no green or orange light changed dc-in

I have a A1278 Macbook, have no power (no green or orange light on power adapter). The magsafe adapter is good and just changed the DC-in still no power, any suggestions on what might be wrong or tests I can do?

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I just had a customer with this issue yesterday. Same symptoms. Changed the battery and all was well. It kind of surprised me.

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Shouldn't the unit power up with no battery

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No, some times they require a working battery.

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Went tp apple store - computer will boot up with a new battery but still no lights on the power cord - not charging and nor will it power on with AC alone? For 1 minute today I got a green light. Does this imply a magsafe DC-in problem or logic board - any way to diagnose

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DPWCT will be eternally grateful.
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