Please create your own thread rather than trying to take over this one. You computer is a mess so please post the same report once you have created your own thread.
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I recent picked up a 27inch 2013 imac. It was displaying full resolution when I first turned it on, but after I installed all new updates and sierra I am only presented with 1280x720 res. I have tried resetting the PRAM. Reinstalling sierra. And the option key to display other resolutions in the preferences. Pretty much everything I could google I tried... I am out of options and decided to make my own thread.
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Restart the computer in Safe Mode and then restart normally, if that doesn't fix it then re-install Mac OS again. If that doesn't work, then I'm out of ideas and you need to take it in to be looked at.
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I have done as it was the same issue I added the information to this thread. Thanks for your advice
2013 imac 27 inch stuck resolution