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The Mac Pro First Generation is an Intel Xeon-based workstation computer manufactured by Apple Inc. The first generation model includes the machines from 2006 through 2008.

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GPU not detected - Diag LED 7 OFF No video

Recently I bought for 300 PLN a mac pro 8 core from 2008.

I borrowed from my friend GPU - Radeon HD 6850 from Sapphire

Computer powers on 3 of 4 diag led are on but the last one that should be on (GPU) is off. I boot from El Capitan HDD.

GPU spins. I used even ASUS GTX 285 and there was still the same problem

I also tried Quadro NVS 295 but it was as the only GPU that was causing RAM error.

I noticed that after some time goes asleep.

Thank you in advance for help!

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Tanizna 300PLN :) got few of them as well.

But - on Apple Radeon 2600XT works ? If no - then dead PCIe - if yes - possible dust in PCIe - use hoover + compressed air.

Is 6850 Apple flashed?

6850 MUST 100% work in 2008 as I flashed them many times.

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obvious crazy question - did You put all power cables to GPU?!

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Maciek Welk will be eternally grateful.
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