A Mohawk haircut is reassuring in some contexts. Behind the counter at a computer shop, for instance; nothing says digital literacy quite like a nose ring. In addition to at least one credible-looking employee, DC Parts offers closeout prices and sage advice. The store has columns of refurbished hard drives and monitors, enough cable and wire to reach Guam, and Big Lots-type odds and ends, like tape-head cleaners for $1. Retail, schmetail. Pentium I -- that's old-school.