>> Method #4: Apply External Vin Power Backwards I know this one isn't true, because I did this last night with no ill effect. I accidently connected a 9V powe

>> Method #4: Apply External Vin Power Backwards I know this one isn't true, because I did this last night with no ill effect. I accidently connected a 9V power brick with the leads reversed. Nothing happened, the Arduino just doesn't turn on until you reverse the leads.