Chosen Solution
As the photo shows, I wonder how do I connect them back in correct sequence, black-white-green-red?
Kyle, that’s the the iSight/Mic board, looking at the inside top of the the iMac bezel. The cut cable is most likely the mini USB feed. Unfortunately, I haven’t yet located a good pic showing these wires - as there is shield foil over the connection normally. I did find the whole part available on eBay here: http://cgi.ebay.co.uk/iMac-G5-17%22-iSig… Good Luck!
with the cables on the left and the camera lense pointing away from you there will be 4 contact points on the left side of the board this where the cables connect starting at the top, on the top edge where the isight lens is the order is as follows black white green red hope that helps!