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How cancel High Sierra Installation?

My main iMac screen just was broken so i'm using a second monitor, but during the install I can't see anything just a white screen on the second monitor, and every time I try to hard reset the iMac enters again into the install, so now I'm on a loop

Has the installation (not the download) commenced yet?

最后更新：2017-11-09 16:16:55

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