This is a post of semi-random electronic carnage.
This is some plastic that went between the metal case and the circuit board. The two things sitting on it are capacitors. It appears they went off like bottle rockets.
The high-voltage area of the power supply. This is where the failure occurred. Note the charring.
This is the top of the power supply. Some of the caps are definitely exploded.
This is the low voltage area of the power supply. There isn't much visible damage here.
This is the grounding bolt. Note the burn marks.