No Chime, display or illuminated power button QS Dual 1 Ghz

Hi. I have a PM G4 Dual 1 Ghz. It was a great computer until about 2 years ago when it sadly stopped working. I found a broken capacitor on the motherboard (No. 820-1342-B) , so figured it was a bad MB. I replaced the board with a (No. 820-1276-A) board and had no luck. The symptoms-the same as on the new board. I purchased a tested and working board (No. 820-1342-B) and still had no luck. I am beginning to suspect a problem with my processor card or my power supply but I don't want to put any more money into it. I have tried to reset PRAM but the keyboard isn't recieving power. The symptoms: Power light when pressed in, red light on logic board, fans, hd, and optical drive work. No keyboard, display, or chime. Please help- I want to donate this computer and can't bear throwing it away

You never said if you replaced the PRAM battery.
I would check it first. When mine went, I had no response from my Mac at all; just a light on my power button; absolutely no boot at all.
For G4's and earlier models, check out things in Texas Mac Man's Battery, PRAM, PMU tutorial on the subject.
There are other tips in there too.
Dale

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