Brand New iMac freezes when external display connected

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I'm having an issue where when I plug my Apple VGA adapter to my brand new iMac, it completely freezes. As soon as I unplug the adapter, it unfreezes. Also, if I plug in the adapter without the vga adapter, it does not freeze until I plug a vga cable into the adapter. Can anyone help me with this one?
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Turns out that the solution is patience. After allowing the iMac to sit frozen for some time, it eventually starts working.

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