Difficult, did you try 32 bit on the HDD?, if this fails to, then the IDE/SATA controller on the board or the traces that link the controller to the southbridge may be damaged, if you have one, or can afford one, try a new board, if this fails, then it's your hard disk!
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Difficult, did you try 32 bit on the HDD?, if this fails to, then the IDE/SATA controller on the board or the traces that link the controller to the southbridge may be damaged, if you have one, or can afford one, try a new board, if this fails, then it's your hard disk!