Nvidia's strong third-quarter earnings report and $65 billion revenue forecast fueled an initial surge in global stock markets before sharp declines and volatility ensued.Jensen Huang dismissed tech bubble fears during the earnings call, but the Nasdaq and S&P 500 saw significant losses linked to Federal Reserve uncertainty and economic data.Major banks issued bullish ratings on Nvidia and tech stocks amid AI-driven demand, while Asian and European markets showed mixed reactions with tech shares falling notably.