Whew. I am no Geek Squad but I would suspect that since both ports are powered that they conflicted and you shorted something in both computers that is an integral part of the motherboards.
Typically the USB ports are protected by a fuse. But I believe they typically reset when you power down and power back up. Or rather whne the fuse cools down it will reset.
If it shorted a wire on your boards I don't think there is a cheap and easy fix.
I am not an employee of Best Buy. All opinions and comments are my own.
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