HT204156: About the screens you see when your Mac starts up
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Q: My iMac shows the boot up screen then shuts off and shows an error screen saying it is rebooting then repeats what just happened. ... My iMac shows the boot up screen then shuts off and shows an error screen saying it is rebooting then repeats what just happened. I don't know what to do any help would be appreciated. more
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Jan 24, 2016 10:07 AM in response to Brendan Guteby Kappy,Reinstall OS X. Unfortunately, you haven't provided any helpful information, so this is all I can suggest. Hopefully, you know how to reinstall whatever version of OS X you have installed.