Sept 27 (Reuters) - The Nasdaq index slipped at open on Monday as investors swapped technology heavyweights for stocks linked to economic growth amid increasing confidence in a recovery. The Dow Jones Industrial Average (.DJI) fell 58.73 points, or 0.17%, at the open to 34,739.27. The S&P 500 (.SPX) opened lower by 13.36 points, or 0.30%, at 4,442.12, while the Nasdaq Composite (.IXIC) dropped 93.52 points, or 0.62%, to 14,954.18 at the opening bell.