NEW YORK (AP) — Mayor Michael Bloomberg has rung Wall Street back to business.

Traffic is snarled, subways out of commission, streets flooded and power out in many parts of the city, but the New York Stock Exchange opened without hitch Wednesday after an historic two-day shutdown, courtesy of Hurricane Sandy.

Bloomberg rang the opening bell at 9:30 a.m., right on schedule, as stock traders cheered from the iconic trading floor below, falsely rumored to be flooded, but dry Wednesday morning, and festive.

The market got off to a mixed start after the shutdown. The Dow Jones industrial average gave up an early gain and was off 11 points at 13,096 at midday.

The Standard & Poor's 500 index edged down one point to 1,410. The Nasdaq lost 15 points to 2,973.