No power at key

Thanks for the replies guys. I do have a new mini-starter and it has only been used to start the car monthly for the last year or so. The car started fine until last week and all lights etc. worked OK. The battery posts showed 12 volts and then I tested the cables (attached to the posts) and they showed 12 volts. So the starter and starter-relay are new but I'll try whacking the starter just in case it's faulty. I tend to agree that there may be a bad ground or a short somewhere and as I'm not an electrical whiz I'll keep trying different things. Maybe I tested the battery connections wrong?