The major averages' early Friday rally soured in the afternoon as big-cap techs such as Apple (AAPL) retreated, with many falling below a key support area. Apple, the world's largest company by market cap, fell 2.1% to 652.59, closing below its 50-day moving average for the first time since just after its disappointing earnings report in late July. The 50-day line is a key resistance line for leading stocks, a place where mutual funds and other