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This is one of those occasions where I wish I were on site to take a look at what is going on .
about ESD, yes it's always possible, it's alos possible that prior to your obtaining the system that someone has touched something they shouldn't have when not being grounded. Effects of ESD may shown up immediately or after an hour or after 10 years ..
Certainly with all that you have said, the indications are that the mobo has died. The only other thing I can suggest right now is remove the motherboard and try to test it out sitting on a block of wood. Shake it thouroughly after removal just in case a screw got lodged inthere somewhere and might fall out.
You have tried everything else .. except that maybe in BIOS the IDE has accidentallly been disabled!! try disabling, reboot, enable, reboot to force it.
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