3 Mac Pro 5,1 turns on on ac plug, no chime, no video, no keyboard power
Hi everyone!
I have a mid 2010 A1289 Mac Pro 5,1
It turns on. Front, rear, psu and gpu fans spin slowly, both optical drive and hdd spin on turn on, but there is no chime, no video and no power to keyboard, so resetting PRAM is not possible.
If diag button pressed, PSU PWROK (Green), 5V STBY (Yellow), EFI DONE (Green), GPU OK (Green).
I removed the backup battery to reset the Real Time Clock chip, and after doing this, the computers turns on automatically when plugged in ( as in power-on on ac back configuration).
Tried apple’s suggested minimum configuration test. When turned on without processor, processor red light illuminates. And it goes off when processor is installed back. The dim leds never illuminate, whether dims are installed or not.
Has anyone seen these symptoms before? Any help appreciated.
Questa è una buona domanda?
17 
34 
3 Commenti
@mayer any ideas?
da Dan
@luissuma - What GPU does it have installed?
da Ben Capehart
Hi @beanman56! It is the default HD5770, I’ve tried removing it as well just to check if it changes the behavior described, but it is still the same, with or without gpu.
da Luis