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The Early 2009 Mac Pro—also known as the Mac Pro 4,1—introduced Intel's Nehalem architecture to Apple's line of professional desktop computers in March 2009. The Mac Pro 5,1 used the same interior design but received further CPU updates in 2010 and 2012.

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Mac Pro (2009) display won't turn on.

Hello,

I’m having a little issue. I took my Mac Pro apart to clean it and when I put it all back together, I get no video and my monitors don’t turn on. I tried booting the computer with each video by itself and it doesn’t work either.

The computer turns on, I can hear the hard drives boot up, all the fans turn on, just no video. What could be the issue?

Any help would be greatly appreciated.

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Do you hear the boot chime? Does capslock key work after you think it's "finished" booting (helps if your keyboard has a capslock light). If yes, then yeah it is probably a video issue. If not, something else is wrong and it didn't finish booting. Also if you short-press the power button and it turns off immediately then it probably didn't finish booting either.

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Blow out the PCI slot. Reseat the video card.

Test the monitor out on another machine.

The only way I know to find out if my video card has failed is to put in a known working one. Fortunately I have more than one Mac Pro and use the same cards in both.

The video card, in my experience, is the number one failure on the 1st and second generation Mac Pros. Next is the power supply.

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I tried that and still nothing.

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Did you ever found out what happened? I'm experiencing the same problem. I installed the old (original,) Graphics card and I am getting the same result.

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James Seals zal eeuwig dankbaar zijn.
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