I bought a macbook pro a couple of months ago. I just noticed that the power adapter thing u connect to your macbook pro (thing with the amber/green light indicating when charge is complete) seems to move slightly. The thing is this: When the cord is attached, The front near the light is pretty stable (doesn't move) but the back where the cord prolongs into the ac adapter tends to move up and down while attached to the macbook. Is this normal?