XP HANGS AT STARTUP LOGO

When I open my computer-(Athlon AMDXP2000)-Motherboard ECSK7S5PRO-Memory 256-DDR-PC333-Optical Mouse Keyboard PSII) XP hangs at the startup logo and will not move beyond that. There is no message or blue, black screen- just the Logo staring me in the face. Can anyone suggest anything at all, please-Thank you very much.