|I guess, you also tried to use another power cable for the hdd. Some of these damn cables a crimped badly, so that sometimes it loses the 5V or 12V power.|
Is that hdd the only drive on that cable and have you checked the jumper settings for master/slave a.s.o.
Is the hdd connected to an onboard IDE controller?
If so, is this an old motherboard, that may have problems with hard drives of high capacity?
Or is there a BIOS update available for that mainboard, that may fix this problem?
That's all, what comes to my mind at the moment.
The original poster should always write the last response !!!
Let us know, if the problem is solved !!!