Have the two of you applied the EFI firmware update available for your rMBP?
You can locate it here:Firmware Updates
MacBook Pro Retina EFI Update 1.0
This update resolves an issue which can cause the system to hang during heavy processor loads, and resolves an issue where NetBoot does not function properly when using an Ethernet adapter.
Also, if you used Software Update, or the Delta updater to update to 10.8.2, you should definitely download and run the Combo
updater found here:
After applying the EFI update and/or Combo update for 10.8.2, you will need to reset your SMC. The following link details how to reset your SMC for the rMBP:
Edit: Original credit for software update and EFI updat links go to Omegal / MysticalOS
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