Chosen Solution

My MacPro 2009 power supply broken and I what to replace it, so buy new one. I looked information or manual how to replace it but can’t find. Here are 2 connectors 1 big black. I think this connected to motherboard. But can’t find where connected the second, small one. This is inside the power supply. I don’t whant to brake it, so i need to be sure how to unplug. Maybe someone knows what it is?

Here’s the Apple Service Source manual with instructions on removing the power supply and cables. This is for the 2008 model but should be just fine for you. See instructions starting on page 32: http://www.scribd.com/doc/17539946/Mac-P