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My Macbook White without a battery inserted. Automatically press F12 and Power Button after idle about a minute?

My Macbook White without a battery inserted. Automatically press F12 and Power Button after idle about a minute? But when I'm using it, it's normal.

I tried to reset NVRAM and all the reset trick. But it still has that error. I don't know is it an error or normal function.

This is an error I get since Mac OS X Snow Leopard. After I format the HDD, and install Mac OS X Lion, this error is still there.

My Macbook White is CPU Intel T7200 Core 2 Duo. 3GB of RAM. 250GB of HDD. VGA GMA945. Mac OS X Lion 10.7.3.

Can anyone help!? I really hate this error. Since I watch Movie, It keep popping up the Gadget Desktop and the Shutdown Windows.