The S&P 500 Index ($SPX) (SPY) Thursday closed up +0.74%, the Dow Jones Industrials Index ($DOWI) (DIA) closed down -0.01%, and the Nasdaq 100 Index ($IUXX) (QQQ) closed up +1.65%. Stock indexes Thursday finished mostly higher, with the Nasdaq 100 posting a 1-week high. Strength in technology stocks led the overall market higher Thursday as Apple closed up more than +4% after it said it plans to overhaul its entire Mac computer line with in-house processors designed to highlight artificial intelligence. Also, chip stocks rallied Thursday on speculation that upcoming Q1 earnings results will sh…