I have a G4 power mac tower. I upgraded the G4 chip from 350 to to 1.2. New video card. New DVD burner. Two new hard drives. Bought new in 2000. Running OS 10.4. I have all the data backed up on external hard drive. The questions is it worth it to fix power supply. The computer won't turn on. How much would it cost to fix. I called Fry's and they will install a new power supply for $40 for labor plus the cost of the power supply. I have a bunch of software on the machine and use the machine as a web browser and to play music. Thanks for your response.