I have a 2008 MP and in a rush to pack I pulled my cord out of my MacPro and just as I did that I realized I had already unplugged my 30" ACD. The cords have been mixed up. They're the same really with the exception of one cord has a gray plug that goes into either the MP or the ACD. On that cord is a white label that reads: 13A 125V~ whereas the other says nothing and is 100% while throughout. I want to think the gray one goes to the ACD but I cannot be certain and I'm afraid to blind test them. Any ideas?