Easier to replace the power supply, but if your a tinkerer much more economical to replace the fan. Richard On Nov 18, 2005, at 9:46 PM, Mark Des Cotes wrote: > Sorry to be a pain, but does anyone know if the power supply fan in > a G4 can be replaced or do you have to change the entire power > supply? I want to fix this ASAP but I'm not sure what to order.