How can I fix my electric Drivers seat?

Re Peugeot 406 electric seats.
Yesterday I left my lights on by accident which completely drained the battery. I managed to jump start it with a friends battery.When getting into the car I find tha the drivers seat ihas moved its full distance forward and will not move from there.The up and down is still working but the the back support is not working either.I cannot get into the drivers seat because it is too far forward. The passenger seat is ok. Any ideas please.