OK, I got shit to due, so here's my final comment (for now). If swapped out both pcs, cabling and ports and the problem pc is still a problem, then I would suggest you do the following:
Pull the box cover, take it outside, get a can-o-air, and blow it out. check the nic card make sure it's properly seated, check the nic socket, and blow it out, and try again
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