U.S. stocks opened with the Dow down 16 points, the S & P 500 down 0.21 percent and the Nasdaq down 0.64 percent. Some star technology stocks weakened, with AMD (AMD. O) down 9.5 percent, Google A (GOOGL. O) down 7.8 percent and Apple (AAPL. O) down 1.5 percent. The Nasdaq China Gold Dragon Index fell 1.5 percent.