I may have to spend some time attending to this other PC at home. After weeks of signs of its symptoms, it has finally succumbed to its sickness. There's no sign of life as the PC couldn't detect the hard disk's existance, let alone trying to boot it. It may be at its very last breath or may have corrupted all together :(
In a desperate attempt to save what I can, I will try to retrieve its data and transfer them to a healthier/brand new hard disk. If it works, this will lessen our burden as we won't feel much loss of data. Wish me luck..