Sounds like things froze up nicely. You did manually reboot? Hold Volume down and power for 10 seconds? Then boot back up?
I would have gone into fastboot and tried wiping data (when off, power + Both volume buttons together)...only use down volume button to go to "recovery" and then the up volume button. Wait a few and then the recovery will show. Wiping data will clear all downloaded aps and all data.