Hi' In most cases this indicate a corrupted firmware or hardware/electronic failure. Do also try to connect the phone to a charger for at least 5 minutes and then try the instructions here http://www.satechhelp.co.za/4971/Common-Hard-Reset-Steps-Android-Powered-Devices if this does not work then you be required to the flash the custom ROM. You will let us know if further assistance will be needed.
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