A system was shorted by a power surge. The motherboard and processor was replaced. The hard drive and memory was tested in a known good system and worked fine. Therefore the only thing replaced was the motherboard processor and power supply. When the new board is turned on without the hard drive it posts fine, but when you connect the old hard drive it clicks. Then we tried 2 other hard drives and they did the same thing, click click click on boot up. Anyone heard of this?