I recently brought a used macbook form 2007(intel core duo, 2.0ghz, 80gb hard drive) on ebay I received it and it work execllent for awhile. The other day I was running it and low battery warning came up, so I pluged in the power cord and thought nothing of it. About 15min later my mac shut down for no apprent reason. I disconcted the power cord and plugged it back in and tried to restart it, the screen flashed but nothing more happened. I noticed that the light on my power cord was flashing between green and orange. After trying this a few times I called friend of mine who repairs macs for a living, he told me to let it charge for a few hours. I set it to charge overnight and tried starting it again to same results; flashing screen and a power cord light switches between green and orange. Anyone know what i should do?