That's an interesting point toolbox, but I'm not sure that it applies here.
Wang: your first step is going to be to determine if you can run that fan at 5 volts. In your case, you've got some extra wiring to sort out first.
If you have a multimeter, you've got an easy way to sort it out. I would recomend using the 5 volt line and this blower by itself (i.e. pull the PSU out of the PC). You won't be able to do the 7 volt trick here, because you have to have a load on the 5 volt line for the trick to work.
A picture would be very helpful, but a description would otherwise have to do. Just remember that we can't see it, so describe it any way you can.
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