Be sure to reconnect the connectors the exact same way you found them, that means the black (grounds) wires as well.
I thought all I had to be careful with was the the red and yellow wires, and messed up an Enermax psu. If I wasn't curious and posted questions to the forum, I might have destroyed a brand new system. Luckily I experimented with a an old two gig drive. Still you can't RMA something after you messed with it. So I'm out an expensive PSU.
I've been told that I can retrace the wires and connect them the correct way (I only sleeved two molex cables), but I don't have the electrical know-how. So I basically bought another one at Perfomance PC's in which they will do (for a very pretty penny) the PITA sleeving for you.
If I had to do it again I would take a marker or colored tape and mark each wire at the connectors to make sure I kept things straight. I did discover that you can keep the sleeving from fraying by melting the ends a little before you begin.
It looked nice, but it was a pc death trap waiting to happen.
Take it from a noob, even something that seems simple with modding a pc....often isn't. :|