It's a volatile day on Wall Street after a short-lived tech rally soured and abruptly reversed course. Micron's stellar earnings report boosted the stock by nearly 20% and reignited the AI trade, helping the Nasdaq 100 jump 2% at Thursday's opening bell. But it wasn't to last. Just a half an hour into regular trading, the tech-heavy Nasdaq's gains reversed, dragged lower by Apple stock, which dropped on news of price hikes on devices as it responds to the memory-supply crunch. Apple officially