Typically when you short power to ground you either blow a fuse, or blow a voltage regulator. This Instructable talks about fixing both, including a picture of the location of the voltage regulator and the fuse on the Mega board. Typically I use inexpensive clone boards and just replace a board if I’ve fired the fuse or regulator. Often when I blow a voltage regulator, the board still works when the USB is connected. Blowing a board has never impacted my computers USB connection, and it is highly unlikely that you hurt your Ramps board.
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