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Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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My battery is fully charged but machine won't turn on.

Just replaced the charger with a new one and charged the battery. The onboard battery tester indicator lights all light up.

But, pressing the power button gets no response at all. Can I get some kind of schematic to do some troubleshooting? Or perhaps there is a common failure of this sort?

I’m a retired electrical engineer so I should be able to do it.

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Have you tried a pram reset? You can achieve this by trying the following:

Resetting PRAM

  • Shut down the computer.
  • Press the power button.
  • Before the grey screen appears, press the Command, Option, P, and R keys at the same time.
  • Hold the keys until your computer restarts and you hear the startup sound a second time.
  • Release the keys.

Let me know how you go.

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jerrymack will be eternally grateful.
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