A couple nights ago, I turned my Pro on and it would boot to the apple screen but then the wheel would start turning under it and about 3 seconds later the computer would shut off. I tried booting into safe mode and looked up different ways to try and boot and none of them worked. I took it to the Apple Store and they said my hard drive had been corrupted. Just wondering if anybody knew what could cause this, as I didn't have any unusual applications installed. Again, I'm not looking for advice as I've already turned it over to Apple to be repaired, just want some thoughts on what might have happened. thanks!