Broke,as in completly at the wire harness, were they touching?, etc.. If they were the 5V, a very important voltage got shorted. If so, then replace power supply and hope for the best, otherwise, the mtrbd. is done in as well.

Leave the broken USB unhooked, unplug the AC cord, wait 15min., then reconnect AC, try to boot-up. If it still fails, the above applies.

tada -----Willy Happy