206 radio stopped working?

Just bought a 51 plate Peugeot 206,and decided to change the old blaupunkt tape player to a goodmans cd player. Had it working, then within 5minutes turned itself off. Tried putting the original back in, and thatno longer works either?!?!
Have heard rumours about the yellow and red remote and power leads are wrong way round...any help?!?!