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Drive spins up and I can hear it read the disc. What are other reasons can there be for a monitor to not receive a signal but the graphic card still powers up I. If it is a logic board problem what could it be and how do I address it? Assuming that it is definitely a Mac Pro 3,1 i. These were used by technicians for troubleshooting purposes, so you may be able to leverage off these to isolate your problem.

As you can see, normally LEDs 3, 4, 5, and 6 are off. In other words, they shouldn't be lit up unless there is an error.

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If any of these are lit up, then you know you have the corresponding problem explained in the Indicates column. Use the Color column to determine the status i. I would check all of them, but obviously you'll want to pay particular attention to LED 7. One of the issues you mentioned in your question was a potentially faulty power supply.

I would actually re-install the one you bought on eBay. The reason for doing this is that some GPUs need more power to function, which is available from connectors on the logic board. And if you have any question marks over the original power supply, it's probably best to put it aside although I acknowledge the one you bought was a used one. So it may be worth looking for the connector on the logic board usually it's close to the front of the board, under the plastic slot holders.

So I'd plug that in if not already and see if that gets it working for you. Make sure you check the cable is connected properly at both ends! If not, in terms of general troubleshooting when there is no LED 7 lit up, you would want to try each of the following NOTE: I know you've already done some of this, but for the sake of completeness and other users I am still including them :. Normally if you have no joy after all of the above troubleshooting steps, I'd say it's time for another logic board. Sign up to join this community. The best answers are voted up and rise to the top.

Home Questions Tags Users Unanswered. Mac Pro 3,1 no signal to monitor Ask Question. Asked 2 years ago. Active 2 years ago. Viewed 1k times. I then did all of the above with the original power supply re-installed I have connected the power cables for both cards I tried, there is nothing else in the other pci slots. Advice OR ideas would be appreciated.

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IconDaemon Alaska Man Alaska Man 8 8 bronze badges. A fan powering up is not an indication that the graphics card is functioning - it just means that the fan is getting 12V to spin. The first thing you should do is try the graphics card in a different machine - a PC would do just fine. One other thing to check is that power supply. I find it odd that a logic board would function with the exception of the PCI bus. Also re-seat all components and cables.

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This simple procedure has fixed many weird problems for me in the past. I was just looking over your question again and realised you haven't provided any details of the amount of RAM it has. These machines can be funny about what memory modules are in what slots, so it may be worth you adding that info in as well. Once you've done this, let me know how you went. See all condition definitions - opens in a new window or tab Read more about the condition. Sale Terms This item is New , guaranteed to arrive in working condition and guaranteed to satisfy for 60 days afterwards.

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Email to friends Share on Facebook - opens in a new window or tab Share on Twitter - opens in a new window or tab Share on Pinterest - opens in a new window or tab Add to watchlist. Image not available Photos not available for this variation. New: A brand-new, unused, unopened, undamaged item in its original packaging where packaging is applicable. Don't start skimping on the accessories! Instead, opt for better value with a cable that doesn't cut corners. A inch cable length helps ease installation or removal of your graphics card tremendously instead of limiting you with a short leash.

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