SAN FRANCISCO Tech stocks crashed in early trading Monday, as the sector joined in a broad market retreat fueled by more fears about the debt crisis in Spain and Greece. Among leading tech stocks, Apple Inc. , Microsoft Corp. , Intel Corp. and Hewlett-Packard Co. were each down more than 2%. The tech-sector’s decline helped drag down the Nasdaq Composite Index by 66 points, or 2.3%, to 2,857.

