Postagem original de: Brian ,
It sounds like the inverter is going bad, or has a loose connection. If you can hold a flashlight up to the screen when it is dark and still see text on it your LCD inverter is the problem. You need to replace the inverter board if needed or find the loose connection if that is the problem. They are guides for replacing the inverter board here on ifixit for the A1150 model. Sounds like you have already upgraded the RAM and hard drive. ( a fast hard drive?)..... as far as making it faster thats about it..... they are some people that go as far as upgrading the processor, so i have heard but have not looked into or done this myself... Your system bus speed would remain the same so how much performance vs how much trouble all that would be isn't worth it , at least to me, my opinion.