Computer composition

[Tobias_Marco]

<This may seem like an odd question, however I am going to ask it anyway.>
<What atomic elements are in a modern computer and in what percentages?>
<I know that silicon, copper and gold are often used, but what other elements are needed?>
<The reason I ask is that I am writing a story and I want someone to build a computer from the ground up (literally). Think the professor on Gilligan's inland, what would he really need to build all that stuff he made?>