We present new results for the atomic H(1s) resonance near an aluminium surface. Two complementary techniques have been implemented: the complex rotation method and the stabilization method. We employ large-scale matrix diagonalization and realistic effective single-particle potentials. Teh adiabatic evolution of the wave function and the resonance parameters as a function of the distance d from the surface is analyzed. We find significant differences for the position and width of the resonance compared to previously available data. Implications for electronic transitions in atom-surface collisions are discussed.