Screen auto turns to minimum....not shutting down nor sleeping

I have my first generation macbook white, sometimes while i was using my laptop, the screen would automatically goes off to the minimum brightness, actually look like when the bar of the brightness is turn down to the minimum where you actually still can see a very faint screen (with programs opening behind) not sleep. No matter what buttons i have triggered, it's doesn't response at all i have to restart my computer. My batt is faulty so it is removed, i work only on the power plug...why does this happen? could the cause be the battery that is removed?

Hrmm..sorry to mention that it is not to the minimum, It is not a single bar shown...brightness is turn to zero instead.

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Screen auto turns to minimum....not shutting down nor sleeping

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