My own CSI-style investigation leads me to the following:-
Colour of smoke: Consistent with high-density electronics package suffering catastrophic failure. Likely caused by extreme excess current possibly result of local short-circuit.
Location of explosion: Underside of laptop. Could be a SODIMM module going up in flames or, depending on the laptop design, the CPU. I would guess the RAM though, because CPU's generally pop without that amount of smoke.
The only other thing I've seen go up like that before was an AT PSU set to 110V plugged into a 230V supply.
Colour of smoke: Consistent with high-density electronics package suffering catastrophic failure. Likely caused by extreme excess current possibly result of local short-circuit.
Location of explosion: Underside of laptop. Could be a SODIMM module going up in flames or, depending on the laptop design, the CPU. I would guess the RAM though, because CPU's generally pop without that amount of smoke.
The only other thing I've seen go up like that before was an AT PSU set to 110V plugged into a 230V supply.