U.S. stocks began down in early trade Monday.
Oil prices rose sharply and Iran rumors added to the unease across markets.
The S&P 500 slid quickly amid volatility.
Tech stocks pulled the market lower due to valuation concerns.
The Dow notched a modest rise but most shares were flat to lower through midday.
Traders think earnings will reveal whether big tech and consumer stocks can recover in the coming days once volatility eases.