Renault Megane electric problem?

I went to get in my car and when i opened the door a loud tack tack noice started over and over, like the doors were locking unlocking over and over.
I pressed the buttons on the key - nothing
I put the key in the egnition - nothing
I pressed the start button nothing -
I got out the car and walked away from the car incase the key car had something to do with it - nothing
I took out and put back in the fuses 1 by 1 - when I took the yellow no 20 for windows out the noice stopped. phew!
But the car will still not start
I put the fuse back - no change

Any ideas what to do next?