A MacMinute reader reports that Apple has started shipping the replacement power supplies as part of the company’s Power Mac G4 Power Supply Exchange Program. “I just received my replacement MDD Power Supply. Put it in, and it is SUPER quiet — no muss, no fuss. As for parts return, mine has a ‘Parts Disposal’ page that says, ‘The parts you have replaced as part of this exchange program should be disposed of in accordance with local laws.'” The program, which was announced last month, offers owners of Power Mac G4s (Mirrored Drive Doors) the option of reducing the operating acoustic level of their systems by exchanging their original power supplies and system fans for new, quieter versions.