Removing the power supply

Disconnect the power connector from the logic board (this looks alot like a standard ATX connector. The lone difference is that the wire which supplies -5V on an ATX supply [pin 18] becomes a ground wire in the B&W G3. If you just plug in an ATX supply without any modifications, you'll short out its -5V output. )

There is a 4-Pin Cable connected to the front panel box, remove it.

Disconnect the internal fan cable.

The Fan Connector

Then Route all of the cables up through the case to the level of the power supply.