I recently bought a Macbook pro from a friend for next to nothing, this is my first apple product beside the iPhone, I decided to upgrade the RAM from 6GB in total to 8GB which required buying a new chip. At first I salvaged a 4GB stick from an older laptop which did not work, which was odd since it's exactly the same as previous one so I bought another from Amazon which claimed to be compatible. After receiving it and swapping it out for the older one I'm getting the same issue, the laptop will not boot due to it probably not recognising it. As far as I know the 2010 Macbook should have a maximum of 8GB but I've run out of ideas as to why it won't accept it. Any ideas?