Using an inductive load (like a motor, fan or solenoid) on a MOSFET, without a diode across (see Fan documentation).This can happen by dropping a metal object onto the board, bad soldering, loose wires, un-protected wires, etc … Shorting 12-24v to anything else, which is essentially the same as plugging it into a place you are not supposed to (see above).Problems with the 5V or 3.3V power are not as much of a problem as the board is 5V-tolerant, so wrong connections and shorts should be okay as long as they do not last too long. Like the 5V line, or an end-stop or thermistor input for example. Plugging 12-24v (motor power) into anything you are not supposed to.
Here are some common mistake users do that cause the board to get too much power and die: The general idea is: if a part of the board gets too much power, it will get destroyed. Smoothieboard is reasonably protected, but there are still things that will destroy it. This is why it is very important you make sure you do not destroy your own board. But if you destroy your own board, your only options will be to fix it yourself (which can be quite difficult), or get a new one. If you receive a bad board, you will get a replacement.
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