When using my power adapter, the light is green for a two seconds and turns red.

When using the power adapter for my MacBook 2.1, the little light on the connector is green for 2 or 3 seconds and then turns red.  I bought a new adapter, but it is the same thing. It looks like the computer is charging.  What's wrong with it.

Nothing wrong. Here is what Macbook manual has to say:
When you first connect the power adapter to your computer, an indicator light on the
power adapter plug starts to glow. An amber light indicates that power is going to the
battery. A green light indicates that no power is going to the battery, which can mean
the battery is fully charged, is not installed, or has a problem. If you don’t see a light,
your plug probably isn’t seated correctly. Check for any debris and remove it. You can
monitor the battery level using the Battery status menu in the menu bar or by
checking the battery level indicator lights on the bottom of the battery (see page 74).

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