Any idea on what the donor is? Can you see inside the case to check wire colors there? Can you take the rear case off to check the wiring? I'd try all of the above, and anything else anybody else thinks of before I'd fry it by wiring it up wrong. JM2(damn, when did they quit putting a <cents> symbol on keyboards when I wasn't looking). If you have to guess, I'd put the bottom wire in the same place relative to the heat sinks. I'm also sure there's a way with a multimeter to figure out which is which, but I don't know how.

Not responsible for advice not taken...