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Mac Pro boot without video

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Hi,

Mac Pro 4.1 8-core with 128gb RAM

I have big problem with Mac Pro, yesterday in photoshop session the mac crashing and won't reboot. Chime and reset PRAM work fine but i don't have any video.

In the Mac Pro i have GTX 970, my first diagnostic is Nvidia Web Driver just turn off so i put my original GT120, but i don't have video too.

My diagnostic GPU LED : turn off so i don't understand. Motherboard is broke? I try my 4 PCIE slot without result.

What i try :
- RESET PRAM
- RESET SMC...

Mac Pro boot without video

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