Wall Street looks set for a mixed open today, with the Dow showing early weakness due to disappointing earnings results from components IBM and United Technologies, but the Nasdaq again trading in the green and looking for its fourth straight record Dow tumbles on weak IBM, United Tech earnings Wall Street looks set for a mixed open today, with the Dow showing early weakness due to disappointing earnings results from components IBM and United Technologies, but the Nasdaq again trading in the green and looking for its fourth straight record Check out this story on USATODAY.com: http://usat.ly/1MFtA4H Toshiba's Chief Executive resigned Tuesday, a day after an outside investigation said he and other current and former executives were responsible for an accounting scandal in which the Japanese industrial and electronics giant overstated profits.