I have an early model 21.5" Mac, Nov 2012 with the fusion HDD. A couple of moths ago the Mac started to drop me out of Safari, a little later it then rebooted before finally not being able to switch on at all. A new HDD fixed it, for a while, then the same thing happened, the repair guys said I was just unlucky an got a dud HDD, so they replaced it again. But it has now failed again so it's super unlikely to be a dud HDD. what can cause a Mac to kill the HDD? I should add that the utility disk software can't fix it. Do you think I'm throwing good money after bad to keep fixing this as I'm not sure if there is anything cheap in the Mac other than the HDD to replace. Thanks in advance.