Answer to "PB G4 1.67MHz. No display, fans loud when PB turned on"Thanks..I had replaced the power module and it was working fine for a couple days.. then when i pressed power button i would hear the drives turn on but no display. I took out ram put it back in and also reset PMU (shift/ctrl/option/power).. it worked for a couple days, then same thing no display but could hear the drives ( but also tried external to my LCD TV with a DVI to HDMI adapter and the light came on the adapter when I turned it on but no display to TV. I took out the top stick of ram with a 1GB in bottom..it came right on!!!!!!