Next, remove the 4 screws that hold the main PCB in place. These are usually at the corners, although some power supplies use six for no apparent reason. Now might also be a good time to unscrew the rear fan from the casing, as the wires are usually short and don't offer a lot of leeway. Some power supplies will have a 2 or 3 pin plastic connector that allows you to disconnect the mains plugs from the board. Disconnect this if you feel it will help. Remove the PCB from the PSU casing, taking care not to lose the clear plastic insulator that is probably underneath.

Now follow the 2 wires from the fan to the circuit board. These are often bundled up with the main loom, so cut the zip ties and separate the fan wires from the jumble. These will either be soldered directly to the PCB, or connected via a small white connector. This doesn't really matter.

Now, remove the black wire from the PCB in any way you see fit, leaving the red in place. I used my soldering iron to heat up the solder on the back of the board, and pulled it off. If the fan is plugged in using a connector then you should probably cut it off right at the base and then make sure the ends are insulated.

If you cut the wire off, you will need to strip and "tin" the end of the wire. Strip around 5mm of insulation off using a knife of wire strippers making sure to twist the strands around at the end. Then, take your soldering iron (you do have one, right?) and feed a little solder onto the tip, making sure there is a clearly shiny area. Put the bare end of the wire against this and using your 3rd hand, feed some solder in - ensuring it "takes" to the wire and wicks up the solder a little. Once cooled you can check this by bending the bare wire. It will feel much stiffer than before.

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