I have had about a 96% success rate in these used power supplies. I have yet to have one of these breakout boards go dead. Even the prototypes I received back in December are still ticking strong and have many hours on them now. The breakout board has nothing to do with the fans at all, that is all done inside the power supply.
So if you see one light with the power switch flipped to off, then when you switch it on you see two green lights, and still have no fan - it is most definitely the power supply.
Well, I had a few of mine do what you said, made the proper solder connections on the breakout board and everything is just fine now. Meaning it was not the power supply. Be careful of making flat statements.
I'm not saying this to discredit the breakout boards at all. I absolutely love them!!! I just thought the record should be set straight.
If you have had this problem you should elaborate exactly what you had to solder to fix your breakout boards for the previous poster that is having this issue, instead of just telling me I'm wrong. Nothing is really accessible anyway. I'm curious exactly what traces you are correcting. J4bberwock can easily confirm if a defect in his board could ever precipitate this issue. Out of the 68 boards I have been running for over 6 months now I have had no issue with any of them in any case. I just paid for 50 more.