Hi Scifan57.
Thanks for your reply .I will try Apple ,but I think from talking to then that in Australia they require proof of purchase.If the fault is on the logic board it's no problem to swap out,But I need to know where the problem lies.I would strongly suspect the board ,but don't want to purchase a board and find that's not the cause.Apple are reluctant to say where the problem is-as usual.,their products are sacrosanct.Cheers.