I just changed the hard drive in my parents system 2 months ago. I think it might even be the third drive (first two were used) in the last 6 months. But this one was new. Now the computer can't recognize the drive anymore. It shouldn't be because of a lighting strike (connected to an APC UPS) and it is a desktop so it hasn't been moved or dropped. Its about 4.5 years old..Asus P4P800-E deluxe motherboard, P4 3.06HT, Windows XP