It is 3:00 in the morning. Your eyes are red-rimmed. Your hands are jittery from too much java (or too much Java, as the case may be). Deadline: 9:00 a.m. Suddenly, a message of alphanumeric technobabble informs you that your system has crashed. Who to call? Chances are your computer manufacturer's so-called support hotline will politely inform you to call back during "regular business" hours. Fortunately, the Geek Squad's regular hours coincide with yours: 24/7. It's guaranteed: The 900-pound geek of Twin Cities computer repair promises to call you with a response to your crisis within seven minutes after fielding your S.O.S. Reports of this group's activities suggest they deliver on their promises. Drop-off support is available at their headquarters every day of the week, from 9:00 a.m. to 5:00 p.m. Monday-Saturday and noon-5:00 p.m. on Sunday, but phone support and emergency on-site service is available whenever the need arises. For trips within 20 miles of the Cities, there's no extra charge, and their rescue fees are set at a flat rate, which generally works to your advantage when the minutes and hours of repair time start to mount. For instance, phone support is charged at a flat rate of $29, not by the minute. The GS even offers free services when your problem isn't a crisis--carry-in problem assessment, virus removal, and e-mail tech support, all within 48 hours of drop-off. Best of all, at least for the Mac crowd, they don't just do Windows. So at 3:00 a.m., when computer-generated heart palpitations threaten your livelihood and your life, remember: Somewhere in the night there is a former dork, now an extremely cool comphead, ready to help.