At the same time press the following three:
 
Top power button,
Camera button,
Reset Hole on the bottom of phone.
 
I've come to know it as: Power, Camera, Hole! 
 
 
The above will put you in bootloader mode to flash a new rom...
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Edit: Wow?! I need coffee....THE CORRECT SEQUENCE FOR A HARD RESET IS: 
GREEN button, RED button, HOLE.