Creda shower won't turn on?

Went to turn creda aqua ambiance shower on and won't turn on there is power going into shower had it check so no problem with power I have a main power swith in airing cupboard that I switch the power on with. when I switch it on from there you usually here the shower click then press power on with the power switch on the shower and should work. but now I'm not hearing a click at tall nothing what so ever any help please the show cost a lot of money and don't want to scrap it just yet thanks in advance