Almost certainly a hardware problem. Start by testing the hard drive with a bootable CD containing SeaTools for DOS:
http://www.seagate.com/gb/en/support/downloads/item/seatools-dos-master/
Almost certainly a hardware problem. Start by testing the hard drive with a bootable CD containing SeaTools for DOS:
http://www.seagate.com/gb/en/support/downloads/item/seatools-dos-master/