[weaksauce]

Really the only thing that could possibly kill you is the capacitors inside if you open up the power supply. I think those discharge fairly quickly in modern systems but I am not sure.

The outputs of the system are fairly innocuous because they are DC at a low enough voltage (max of 12VDC) to not seriously hurt you even if you touch both the positive and the negative of one of the connectors. Now if there was some sort of anomaly and the dc lines were carrying a waveform, then if the wave was a specific frequency to match your body's impedance it could actually affect you. This is kind of akin to a "hollywood" terrorist threat though as it would most likely not happen but if it did it would be tragic.