If it does not start properly:
Perhaps a factory reset or softwair repair via PC Companion is something to try before sending it in?
If it hangs/non responsive:
Long press the power key and the volume up key at the same time until your device vibrates.
Depending on whether you wish to force the device to restart or shut down, proceed as follows.
- If you wish to force restart the device: Release the keys at this point. The device restarts.
- If you wish to force shut down the device: Continue pressing the keys. After a few more seconds, the device vibrates three times and turns off.
