A mounting apparatus for mounting a power supply having a first connector on a front side, includes an enclosure, a bracket, and a board. The enclosure includes a rear wall defining an opening for the power supply passing therethrough. The bracket is mounted to the enclosure below the opening, capable of supporting the power supply. A second connector protrudes up from a front end of the bracket, configured for engaging with the first connector of the power supply. The board is attached to a rear side of the power supply, to cover the opening of the rear wall. A plurality of latching slots is defined in the enclosure or the bracket. A plurality of hooks is formed on the board, to engage in the plurality of latching slots.