Computer Repair Flowchart
From Morris Rosenthal's Computer Repair with Diagnostic Flowcharts. Bonus: On his site, the charts are interactive, so clicking on a diamond jumps you to the text for each decision step.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.