Take a look at the sentence again:
Jacques, a self-taught computer whiz, always hates going to his Introduction
to Microcomputers class the reason is that
both his textbook and professor are at least a year behind when they discuss
software and internal components.
No punctuation of any kind is necessary between is and that. The reason is is a main clause that begins a complete sentence. That both his textbook and professor are at least a year behind is a subordinate clause. Generally, when you attach a subordinate clause to the end of a main clause, you need no punctuation.
Go back to the sentence to try again.