Wall Street stocks experienced a sharp reversal, falling from early gains as technology sector strength faded. Nvidia's earnings initially boosted markets, but subsequent U.S. jobs data introduced uncertainty regarding the Federal Reserve's potential December interest rate decisions. The Nasdaq and S&P 500 closed at their lowest points since mid-September, while the Cboe Volatility index, a measure of market fear, hit its highest close since late April. Investor concerns over high technology valuations persist amid significant artificial intelligence spending.