U.S. stock markets experienced a downturn as major indexes ended slightly lower, largely driven by a sell-off in memory chip stocks and mixed reactions to bank earnings. The Nasdaq reported notable losses, heavily influenced by declines in chipmakers, while the S&P 500 saw slight fluctuations due to strong profit reports from major banks like Goldman Sachs. Investors are awaiting further economic data, including the consumer inflation report, amidst concerns regarding the future performance of technology stocks. Overall, the trading day reflected a cautious sentiment as the earnings season kicked off and market participants assessed the impact of inflation on stocks.