Same happened to me and a soft-reset got it working again. Some confusion about soft and hard reset here, so this is a link that describes how to do the two.
How to Soft Reset the Nokia Lumia 920 | WMPoweruser
If this should happen to you (which anecdotally seems likely) to soft reset the Nokia Lumia 920 press and hold the power button and volume down button for about 10 seconds will do the trick; the phone should vibrate and reboot your phone.
If this fails a hard reset is the next step, but be warned that this is where the reports of bricking have come from. To hard reset hold the volume down, power button and camera button until the phone vibrates, then release the power button and keep the volume down and camera button down for another 5 seconds. Your phone should then reset to factory state.
How to Soft Reset the Nokia Lumia 920 | WMPoweruser
If this should happen to you (which anecdotally seems likely) to soft reset the Nokia Lumia 920 press and hold the power button and volume down button for about 10 seconds will do the trick; the phone should vibrate and reboot your phone.
If this fails a hard reset is the next step, but be warned that this is where the reports of bricking have come from. To hard reset hold the volume down, power button and camera button until the phone vibrates, then release the power button and keep the volume down and camera button down for another 5 seconds. Your phone should then reset to factory state.
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