Cannot use the default monitor
I have a Mac Pro 2009, 2.66 Ghz quad-core with 32 GB of RAM. I installed a graphics card from Nvidia GTX 960 with 4 GB of RAM after you download the latest drivers from the site Web of Nvidia and them preferring rather than the default drivers El Capitan. Of course, I get no screen, as expected, but I kept getting the dreaded "out of range" error message on my shiny new LG 25UM57 ultra wide monitor. To trouble shoot the issue, I also plugged my 1080 p TV. Low and behold, after pressing the option key to detect monitors, my LG appears. But it works only in the mirror. Now, I have to keep my TV connected to my LG monitor. Is there something that I am on here?
Now you can use your TV a second screen, you're not working 'blind' and should be able to make rapid progress in a solution for your new LG which can be supported.
Try a few "easy resolutions with off mirror until you find at least one that works, then see if you can expand to full width.
You did not mention what interface you are trying to use. If not DisplayPort family, there are some limitations that apply.
Tags: Mac
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