After opening seven points higher over its last close at 7,761 and touching a high of 7,781 on selective buying support, the Sensex has shed ground on sustained selling pressure in tech, select banking, and pharma stocks.The Sensex, which slumped to a low of 7,713, is now down 40 points at 7,714. The Nifty, too, is weak at 2,355 - down six points.Satyam has dipped 1.62% (Rs 8) to Rs 515. Infosys and TCS have lost a per cent each to Rs 2,278 (down Rs 13) and Rs 1,276 (down Rs 9), respectively. Wipro has slipped 1.58% (Rs 11) to Rs 712.HDFC Bank has tumbled 1.78% (Rs 12) to Rs 663. Other banking scrips have also lost ground.BHEL has declined 1.21% (Rs 13) to Rs 1,073, while L&T has shed 1.81% (Rs 24) to Rs 1,310. Hindalco has added 1.20% (Rs 16) to Rs 1,361.Dr. Reddy's has dropped 1.61% (Rs 13) to Rs 818. Other pharma counters are also displaying weak trends.