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- Thread starter PeterRollback
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Are you plugging in any external devices on the USB or Thunderbolt ports that you are not doing at the Apple Store?
Try disconnecting everything other than the power cord from it and then try to turn it on. See if you still have the same problem.
Try disconnecting everything other than the power cord from it and then try to turn it on. See if you still have the same problem.
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Start working from the Apple store? 
I would test the outlets both places for proper wiring and voltage. Just because the charger works doesn’t mean it will work for the iMac. Plug the iMac in and test the outlet again. If you have a multimeter, plug just the cable into the wall and test the voltage on the female end.
I would test the outlets both places for proper wiring and voltage. Just because the charger works doesn’t mean it will work for the iMac. Plug the iMac in and test the outlet again. If you have a multimeter, plug just the cable into the wall and test the voltage on the female end.