macbook pro '17 wont power on

i have a macbook pro that wont power, the adapter is always green and i tried the reset thing, and no luck. Im trying to figure is it the battery, because when i press the battery button it just flashes the one(first) light which is green. Should the Macbook power without the battery out and the adapter plugged in because i heard ppl say sometimes they do. basicaly i dont wanna spend 80.00 bucks on a battery if thats not the problem. just asking for a little help, and yes its been charging over night and still the one light blinks when i press the battery button.

Your MBP should be able to power on and off with or without the battery installed. What I suggest doing before investing in a new battery is try another MagSafe adapter to see if perhaps the one you're using might be defective.

chscag said:

Your MBP should be able to power on and off with or without the battery installed. What I suggest doing before investing in a new battery is try another MagSafe adapter to see if perhaps the one you're using might be defective.

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So if the Magsaf adapter stays green, it can still be defective?

Yes. You need to eliminate it as a possible problem before doing any further trouble shooting. Since it's less expensive than a new battery or DC input board, start with that.