Renault laguna 1.8 won't start help

Hi was out in the car the other day went to get back in and nothing the dash lights went on and there was a clicking when I opened the bonnet the sound came from the fuse box on the car near the battery so far we tried a new battery and started but still nothing it seemed to start yesterday about 10 times in a row then nothing I have had a problem with water coming through the light under the visor on the drivers side which I presume is from the sun roof the mecanic said my starter and battery is fine and he doesent know what it is exept the card or the reader

And ideas. I'm new to cars so a bit clueless