I have a small problem, my macbook will start fine when there is no battery inserted, but when I insert the battery and turn on the macbook it goes thru the grey screen, but after that it turns black. If I press any button the screen would work, but is very dark barely visible and only for a few seconds and go back to sleep. Everytime I pressed any button would do that. I bought a new battery and I still have the same problem, I was thinking about buying a new charger, I just want to know if there any other fix before I put more money in to it. Thank you in advance. Forget to mention I have a macbook 4.1 Core 2 duo 2 gb 13"