How to Test a MagSafe DC

Turn the laptop on. Let the desktop appear on the screen. Shut down the laptop once the battery icon in the upper right corner of the screen states that there is less than 50% power remaining.
Rotate the laptop counterclockwise so that you can see the MagSafe DC-input depression at the upper left inside edge.
Plug the power cord attached to the MagSafe’s power supply into a wall outlet. Place the MagSafe connector up against the depression. Let go once you feel the magnetic attraction that is holding the MagSafe connector against the depression.
Turn the laptop on. Do nothing until the laptop’s operating system brings up the desktop. Note that the icon of the battery in the upper right corner of the screen is displaying a “lightning” slash through the battery icon. Write down the percentage of battery power being displayed.
Leave the laptop undisturbed for an hour. Note whether the percentage of the battery power has increased or not. If there is no increase in the percentage, the laptop’s DC-input board is not receiving any electricity from the MagSafe connector. If the percentage has increased, the opposite is true.
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