The green wire test worked but the motherboard is not sending the signal from the motherboard PWR ON to the green wire.
I've seen new techs not want this to be the case but hey, they eventually get enough repair jobs and learn this.
I'm working on a dell precision 390. PC began exhibiting strange behavior, including memory and battery warnings. I replaced both. Now the PC won't turn on when the power button is pressed. The computer fails to respond at all; no display, fans, lights, etc.
I can short the green/black wires on the ATX connector (shown here: https://www.youtube.com/watch?v=nYb7UaWip8w) and it will boot and run normally. I understand this means the power supply still works, but I don't understand what it suggests is broken.
When the computer is on, the power button reliably turns the computer off... so the button appears to work fine. What could be causing this issue? Could it be a capacitor on the motherboard? Is there a way for me to test that?
Any pointers would be greatly appreciated!