Hi forum first time post so please be gentle ;-) i had an issue with my mac book in the sense it turned on with only the grey screen and a continuous spinning wheel. I took it into my local apple store and they told me its the hard drive that has failed. i purchased a 1 tb new drive through amazon and fitted it my self all good up to here. The issue im having is when i boot up and try to install snow leopard i can see the drive in disk utility but it wont let me install snow leopard :-( am i doing something wrong the drive shows as verified but i cant seem to go any further. the message that comes up is something like disk failed and something about memory. can anyone help me please???