What could cause my MacBook Pro 15" not to turn on.

I have this unibody Macbook Pro 15" Early 2011, it will not turn on at all.

When the MagSafe charger (L type) is plugged in, the indicator light on the charger stays bright green. I know the battery is dead because the lights on the side of the mac will not light up when the side button is pressed.

So this is what I have tried so far.

When I tried resetting the SMC, PRAM and NRAM. This did not work.

The green dot on the caps-lock would come on as soon as I pressed down the key combination for either reset.

So after that, I figured that the DC-in board could possibly be bad. I replaced that, and it did not work. Same issues, nothing has changed. I tried the DC-in board first because thats the cheapest part between it, the battery, and the logic board.

I really hope that the logic board isn't bad. I don't really want to buy a new one because they are extremely expensive, even as used.

Im excluding the battery out of my troubleshoot, because the macbook should still turn on with just the charger.

Is there anything els I could try,

I can't really buy any other parts because I am a broke college student.

Any responses will be appreciated.

Thanks