Have you tried a manual factory reset? I'm not sure if what you state as resetting via the power button is referring to an attempted manual factory reset. If you haven't tried the full manual factory reset, I've listed the steps below.
- Connect your Aura One to a wall power adapter and charge for at least 1 hour. Make sure you have access to a Wi Fi connection. Leave it plugged in after the hour.
- Press and hold the power button until the power light on the top-right corner of your eReader turns off. You'll see a 'Powered off' screen when your eReader is turned off. If nothing happens, hold the power button for ~30-35 seconds to do a forced power off.
- Release the power button.
- Press and hold the power button for 30 seconds.
- Wait for the Restore screen to appear.
- Release the power button.
If the restore screen appears, your eReader screen should turn black and begin the restoring process. After the restoring process finishes, follow the onscreen instructions to set up your eReader.