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I am running a Mac Pro as a kind of server for an application, everything is automated and I am usually using Remote desktop. Now I have the need to update the Mac version and just realized that the graphics card might be broken as I have tried two different screens without success and in the system profiler the graphics card information is just blank.
In which log files can I check that the graphic card is not found during startup. What would be the procedure to replace the graphic card as I could imagine version problems...

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I can't say where the log files are located, though you can be fairly confident that if nothing shows up in the Graphics/Displays then the graphics card will need to be replaced. You can check the display and graphics info from the Terminal as well with system_profiler SPDisplaysDataType

I've replaced a few Mac Pro graphics card and the procedure is straightforward. As long as the card is Mac-compatible it's been plug n' play. There are detailed instructions from Apple. And plenty of videos on Youtube.

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I have used the profilinf command and it did not show any info as well. I also saw that Apple increased the warranty on the graphics card because of a too high number of failures on the specific card. – weismat Apr 20 '11 at 8:05

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