The finite (nonzero) resistivity instabilities of a sheet pinch are studied by numerical analysis in terms of normal modes. Results are obtained for the tearing, rippling and gravitational modes and their dependence on conductivity, on wavelength, on the gravitational field, on the position of k · B = 0 and on the positions of the walls. Comparison is made with the analysis of Furth, Killeen and Rosenbluth.