Hi all. I have a black Macbook from the 2006 line. It's been in to Apple a couple of times over its lifespan for repairs. Right now it is on the brink of collapse. It makes a loud, aggressive spinning and churning sound, runs extremely hot on the base, and shuts down on its own. At this point it is completely unreliable. Am I in need of a new computer, or would it be sufficient to upgrade the internal hard drive and, perhaps, the RAM? If so, could anybody be so kind as to point me towards some suitable hardware? I don't know where to start with this kind of thing, so the help would be appreciated!