Does not boot, PMU reset doesn't do anything, what's the PMURST for?
First here is what happened: I had installed Linux and that was working well until I shut it down and it wouldn't turn on any more. Now it's dead in that sense that there isn't even a chime when I press the power button.
I tried a PMU reset, removed extra RAM, removed the battery, etc but no joy.
Previously, when doing a PMU reset (Shift, Option, CTRL, Power and simultaneous release) I noticed the led on the power plug would flicker. Now it doesn't do anything. I've tried with and without battery (which doesn't have the 5 leds lit - is that normal?).
Now I've discovered a couple of pins under the extra RAM on the back of the machine. They're labelled PMURST, GND, +2.5V, +3.3V, +5V. Has anyone ever used these before to do a PMU reset. I've tried connecting each of them with the PMURST with and without power but still no chimes and screen stays black.
Is this a good question?