Jed’s Gateway MX6030 laptop worked pretty well for a couple of years, then the problems started—faulty power adapter, kaput motherboard, dead hard drive. Luckily, he’d bought a 3-year extended service plan. Unluckily, when his motherboard was replaced, the bottom of the laptop—where the serial and model numbers are located—was swapped out with one from a different model, so that when he brought it back for the hard drive repair, the store manager accused him of fraud.