Our Mac Pro A1186 which was turned off for a while during Covid, now does not turn on anymore.
When pressing the power button, it makes a clicking sound, then 3 seconds later another one, and simply nothing happens. No fans spin up, no power light, nothing.
(A) both LED 5 & 6 flash once when the power cable is connected, no other LEDs light up
(B) when the DIAG_ LED button is pressed, only LED 2 lights up as is yellow, indicating that trickle voltage is present
(1) would this mean that the power supply has failed ? Reading the service manual, this seems to be indicating just that.
(2) what is the part # for the power supply to get a replacement part ?
(3) is it possible to use 3rd party (non-Apple) power supplies in the Mac ? If so, what would be the required specs ?
(4) any suggestions on where to purchase a replacement part ?
update: ended up replacing the power supply and the machine now starts up again. Both RAM boards have a red LED lighting constantly while the computer runs... is this normal or does this indicate another problem ? could not find anything regarding this in the service manual...