SAN FRANCISCO (MarketWatch) - Apple Inc. and Hewlett-Packard led an early tech sector retreat on Thursday, as the broader market slipped following Wednesday's selloff. Apple was down a fraction at $446.30 as investors geared up for a much-anticipated conference call later today with hedge fund manager David Einhorn who is challenging Apple's plan to eliminate the practice of issuing preferred stocks. Hewlett-Packard also was down a fraction at $16.67 ahead of the company's fiscal first-quarter report due after the closing bell. The Nasdaq Composite Index gave up 12 points, or 0.4%, to ... Read More