Hi! First I'd remove the battery, just to simplify the situation, and then I'd make sure the memory is seated well, and test both slots, one at a time, by leaving one empty, and then the other. I would also attempt to reset the PMU every time you change the memory configuration.
What color is the light on the AC plug when you connect it to the laptop, and is the light consistent, or erratic?
In terms of troubleshooting, I've learned to never take anything as fact unless I've witnessed it with my own eyes. The fact that the power adapter is new doesn't mean it's working...have you witnessed it working? Do you have the old one, or can you borrow a friend's, or test your new AC adapter on a friend's computer?
This sounds silly, but I'd also try a different electrical outlet on the other side of the house.
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