So I have my machine back now, and after all this it turned out to be the hard drive cable which was replaced at a cost of £10 + labour.
As a bonus, the original hard drive is in perfect working order and I was able to return (for the second time) the replacement I had bought.
The store that was so accommodating and understanding of my issue was the Trafford Centre Apple Store, Manchester.
As a bonus, the original hard drive is in perfect working order and I was able to return (for the second time) the replacement I had bought.
The store that was so accommodating and understanding of my issue was the Trafford Centre Apple Store, Manchester.