Apparatus for securing an array of I/O adapter cards to a case, each one of the I/O adapter cards having mounted thereto a mounting bracket having a screw receiving hole and being adapted to be plugged into a motherboard. The apparatus includes an I/O adapter card mounting plate having captive fastening hardware and tips. The plate is adapted to be placed over the mounting bracket as a single piece. The captive hardware is adapted to pass through a first set of screw receiving holes and tips to be inserted into another set of screw receiving holes. The captive hardware is adapted to enable manual fastening of the mounting member to secure the mounting bracket between the mounting plate and the case after the array of I/O adapter cards has been plugged into the motherboard. Each one of the cards has mounted thereto an L-shaped mounting bracket, such bracket having a screw receiving hole therein. The plate is adapted to be placed over a foot of L-shaped brackets as a single piece. The captive hardware is adapted to pass into the screw receiving holes of one set of the cards to enable manual fastening of the case to secure the array of printed circuit board.