  We study the global bending modes of a thin annular disc subject to both an
internally generated magnetic field and a magnetic field due to a dipole
embedded in the central star with axis aligned with the disc rotation axis.
When there is a significant inner region of the disc corotating with the star,
we find spectra of unstable bending modes. These may lead to elevation of the
disc above the original symmetry plane facilitating accretion along the
magnetospheric field lines. The resulting non-axisymmetric disc configuration
may result in the creation of hot spots on the stellar surface and the periodic
photometric variations observed in many classical T Tauri stars (CTTS).
Time-dependent behaviour may occur including the shadowing of the central
source in magnetic accretors even when the dipole and rotation axes are
aligned.
