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Just made the upgrade to Yosemite but now my iMac wont restart or shut down. Whenever I try to do any of these it stays on a black screen with a mouse pointer, and I have to turn it off and back on manually.

Any help?

  • Can you describe your problem with more details please? Are you inside Yosemite? And then you click on the Apple-Icon and Shut your Mac down? Which iMac do you have? – Bastian Gruber Oct 17 '14 at 14:38
  • did you try any of the start ups like Safe mode....and you made a USB? – Ruskes Oct 17 '14 at 15:14
  • @miro What is your System Model ? – Shanmugasundharam selvadurai Mar 25 '16 at 11:13
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Mine was showing a black screen after I updated my iMac to Yosemite.

I unplugged my USB mouse and the new Login screen was displayed.

No restart was necessary.

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