This is my first post so please be gentle lol

I went to drive my 1999 A4 1.8T Quattro yesterday and the remote central locking didnt work... I opened the driver side door with the key but when I tried to start the car... nothing!

I changed the batteries in the remote today which made no difference... but I've noticed there is no power at all... no interior light nothing! I've checked the battery which is properly connected... so what is likely to have caused a complete power failure???