To be sure I understand you, this pin came on and you could play a game before you picked it up last night. You hauled it home, put the legs on, and when you stood up the backbox pinched some wires. After moving the pinched wires you turned on the pin and some lights come on but you get no sound as if the game is booting and nothing on the display, just completely blank?
You have a multi-meter, do you have a manual? Page DR. 1 shows all the fuses and their location on the various boards. With game on if you can safely check F8 & F9 for 12v DC and F23 for 5v DC do so.
For future pictures may I suggest removing the fluorescent light bulb and setting your camera to maximum resolution? If we can see focused shots and read the labels on the boards we can better assist you.