The Sensex has rebounded into the positive zone and is now up 43 points at 13,922.Hindalco has surged 2% to Rs 148. Tata Steel has spurted 1.4% to Rs 560.Ranbaxy has advanced over 1% to Rs 394.HDFC Bank, Infosys and Wipro have slipped 1% each to Rs 990, Rs 2,019 and Rs 550, respectively.