Hi I am trying so solve a set of coupled ODE's. I have been able to get a solution from Mathematica using NDSolve, but when I change the coefficients an error appears: "NDSolve::mxst: Maximum number of 10000 steps reached at the point t == 0.0000748339914040257`. >>" I have tried increasing the number of steps to 20.000, but that doesn't help. I know my syntax is correct, since I have been able to get a solution when setting the coefficients c0..c4 to 1 just as the initial conditions. I have attached my notebook. Can I get a hint to what might be wrong? Best, Niles.