The Missing Piece by Menelik Haqq
A teenage scientist wants to invent a supercomputer. A wise old scientist tells him to be successful, he needs to find an ancient missing piece. Finn thinks he knows where to find this piece: in the computer world! Through the magic of science, Finn travels inside his computer to find the missing piece. Will he be able to retrieve what he needs and return to the real world, or will he be trapped inside his computer forever?