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. Mark Des Cotes Systems Manager/Graphic Designer Astro Printing Service (Cornwall) Ltd. 3308 Second Street East Cornwall Ontario Canada K6H 6J8 T (613) 932-9281 Ext 106, F (613) 932-1052 www.astroprinting.com