A phantom sleeper virus installed on every single PC when it is made. Exactly 2 years after you activate your new PC, the Ghost in the Machine awakens and takes over, slowly destroying it until it no longer turns on.

Symptoms of a Ghost in the Machine include: flickering, forgetfulness, random restarts, a frozen screen comorbid with a persistent hourglass, and random deletion of important files. You may also encounter multiple "errors" and be asked to solve problems you don't know how to solve. Customer support usually pleads ignorance when you call their 1-800 number.