I dont think there are any danger of blowing the motherboard, but it did trigger mine to lock up in some weird way.
But that was easy solved by removing all USB plugs in the computer ( i have quite a few ) and then it would boot just fine, i then just shut down again and plugged all my USB devises back in.
The port the camera was on at the time was one of the Lian li case USB 2.0 ports connected to a header on the motherboard, so i think what the camera did was topple the always on USB System, that normally work just fine as i had phone and other things charging from the PC when its been off overnight, and this never happened before.