Mac Pro 2009 dead, black screen

[Guest goodfidelity]

So it has happened.

 

Mac Pro 2009, black screen no boot chime

- Upgraded with 5.1 firmware

- Tested with two different CPU cards, both verified working in other machine (4.1)

- Removed everything, unplugged power, pressed powerbutton for 30 sec

- Swapped in new battery for clock, measured 3.3V

- Tried starting with empty chassie (removed WiFi, GPU, CPU, HDD..)

- Tried starting with no disk

- Tried 3 different GPUs

- Tried removing wi-fi

- Tried holding power button to enter EFI upgrade mode...

 

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