I had the same problem when my battery went flat and tried to use jumper cables connected to another vehicles battery. I called Volvo and they said I need to disconnect the battery terminal to reset the computer. After re-conecting it the remote control worked again and I was able to jump start the car. Maybe your car's computer went into a similar state.
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Toad alarm fitted to laguna2003 1800had to get new key card now car won't start
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