Silicon Valley leads avalanche of quarterly reports

By Noel Randewich SAN FRANCISCO (Reuters) - A quartet of technology heavyweights will be part of an avalanche of quarterly corporate earnings reports next week that, along with a meeting of Federal Reserve policymakers, could hold the key to whether Wall Street extends its record-breaking rally or loses steam. With second-quarter reporting season kicking into high gear, scorecards from Apple , Alphabet , Amazon.com and Facebook will be front and centre for investors eyeing the S&P 500's alre