I have a vintage Imac G5 - 17" - 1.6mz - 512mb I powered down today and now its not starting up. I get nothing, completely dead. I am getting 1 green LED light inside and I tried to reset the SMU and hit the internal power with no other LEDs on and no power. My capacitors look good, nothing broken, bulging or corroded. I had the power supply replaced a couple years ago under apple care. I am hoping my logic board isn't shot now. Can it be the power supply again, even with the #1 LED light on? Does anyone have any advice as to what my next step should be in trouble shooting? Even though I am due for a new computer, I just can't let it go yet. Thanks in advance for any help out there. It will be much appreciated.