Hi! The 840 G3 appears to have a battery compartment that is secured by screws. Sometimes there is a combination of keys that can be pressed that will simulate the function of a power reset (powering the laptop down, removing the battery, pressing the power button for a length of time to drain capacitors, replacing battery, and powering up) so that users don't have to remove the battery. I've googled and found some key combinations for other HP products but can't find one for the 840 G3. Does anyone know of one?