On another computer download the ISO image for Seatools by clicking on SeaFlash in my signature and burn it to another USB flash with that program. You cannot use Rufus for Seatools.
Boot off of the Flash drive and run the Short and Long diagnostic tests on the HDD, if either test fails the HDD needs to be replaced.
Boot off of the Flash drive and run the Short and Long diagnostic tests on the HDD, if either test fails the HDD needs to be replaced.