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another thing, I managed to reinstall high sierra but I cannot activate target display mode. I am trying to stream from a pc with a displayport to minisisplayport cable to the late 2012 iMac but it doesn't work. What should I do? Edit: I think my cable is mini dp to dp, but I can't find a...

thanks, it worked fine!

Hi! I was trying to bring my late 2012 iMac back on high sierra from catalina to use it as a monitor with target display mode. I created the bootable high sierra, it shows up in the boot options but when I click it and wait for it to be ready, it goes on a screen asking me to connect keyboard...