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Original post by: Ozz Blayney ,


I have exactly the same issue with my 27 inch iMac 2011. I connect a Apple LED Cinema Display and the moment I remove the usb and mini DV port the iMac reboots then goes into a rebooting cycle. As soon as you reconnect the led monitor the iMac reboots correctly and runs perfectly. It’s really strange.

Did you ever get to the bottom of your issue?