I have had my Seagate Barracuda 1TB hard drive for about 3 months and my computer has started shutting itself down, usually when its trying to load my OS. I've been able to run seatools and it passes SMART and the short fix all and short generic. However, when I try to run long generic or long fix all my computer will shut down while these tests are running. I've run the windows memory diagnostic as well and thats yielded nothing so far. Can someone tell me if my hard drive is beginning to fail?