Dow, S&P fall as earnings season picks up; tech boosts Nasdaq

Technology sector gains limited losses on the S&P 500 and helped to lift the Nasdaq.The beaten-down S&P technology index was up 0.8 percent.The S&P 500 energy index sank 1.1 percent afterHalliburton warned that fourth-quarter earnings would miss estimates amid ongoing weakness in the North American hydraulic fracturing market.