Abstract: A computer card lock-down device is formed from a bowed piece of an insulating plastic, metal coated with an insulating plastic or the like. A first portion of the lock-down device is formed to be flat and has a screw connection. The rest of the lock-down device has an approximately U-shaped cross-section. At a second portion, the U-shaped cross-section forms a slot for engagement with an upper edge of the card. In use, the first portion is held against the face plate of the card with the same screw used to secure the card in the expansion slot, and the second portion engages with the card. The lock-down device can be bowed sufficiently that it contacts the lid of the computer CPU case. The lock-down device exerts a spring force on the card to prevent the card from coming loose from the expansion slot.