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A mounting apparatus for mounting an expansion card with a cover plate to a rear panel includes a retaining member fixed to the rear panel, and a pressing member slidably attached to the retaining member. The pressing member can be slid down to press the cover plate of the expansion card. The pressi

A mounting apparatus for mounting an expansion card with a cover plate to a rear panel includes a retaining member fixed to the rear panel, and a pressing member slidably attached to the retaining member. The pressing member can be slid down to press the cover plate of the expansion card. The pressing member can be slid up to release the cover plate of the expansion card.

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1. A mounting apparatus for mounting an expansion card with a cover plate to a rear panel, comprising: a retaining member fixed to the rear panel, the retaining member defining a sliding slot and comprises a positioning portion at a side of the sliding slot; anda pressing member comprising a stop po

1. A mounting apparatus for mounting an expansion card with a cover plate to a rear panel, comprising: a retaining member fixed to the rear panel, the retaining member defining a sliding slot and comprises a positioning portion at a side of the sliding slot; anda pressing member comprising a stop portion, a pressing portion, and a sliding portion to be slidably received in the sliding slot of the retaining member;wherein, when in use, the pressing member is slid down along the sliding slot of the retaining member to make the pressing portion of the pressing member press the cover plate of the expansion card, the stop portion of the pressing member is stopped under the positioning portion of the retaining member to avoid the pressing portion of the pressing member disengaging from the cover plate of the expansion card; andwherein the retaining member comprises a main plate and two parallel limiting blocks, each limiting block has a substantially T-shaped cross section and comprises a main piece parallel to and spaced from the main plate, a connecting piece is substantially perpendicularly connected between the main plate and the main piece, the positioning portion protrudes on an upper portion of the main piece, and the sliding slot is bounded by the limiting blocks and the main plate. 2. The mounting apparatus of claim 1, wherein the rear panel defines a card slot, a support wall is substantially perpendicularly formed from the rear panel, above the card slot, the cover plate of the expansion card is inserted into the card slot, with the cover plate positioned on the support wall. 3. The mounting apparatus of claim 2, wherein the rear panel comprises a mounting plate adjacent and substantially perpendicular to the support wall, the retaining member is fixed to the mounting plate. 4. The mounting apparatus of claim 2, wherein a raised portion protrudes on the support wall to engage with the cover plate of the expansion card. 5. The mounting apparatus of claim 2, wherein two blocks are formed on the rear panel at opposite sides of the card slots, to limit the cover plate between the blocks. 6. The mounting apparatus of claim 1, wherein the pressing member comprises a resilient main body, the stop portion extends from an upper portion of the main body, the pressing portion extends from a lower portion of the main body. 7. The mounting apparatus of claim 6, wherein the pressing portion of the pressing member is substantially L-shaped. 8. The mounting apparatus of claim 6, wherein a handle extends from a distal end of the stop portion opposite to the sliding portion. 9. The mounting apparatus of claim 8, wherein at least one connecting portion is connected between the main body and the sliding portion. 10. An electronic device comprising: a rear panel defining a plurality of card slots, a support wall substantially perpendicularly formed from the rear panel, above the card slots;a plurality of expansion cards each with a cover plate covering a corresponding one of the plurality of the card slots, the cover plate comprising a bent portion positioned on the support wall;a retaining member fixed to the rear panel above the support wall, the retaining member defining a plurality of sliding slots and comprising a plurality of positioning portions corresponding to each of the plurality of sliding slots; anda plurality of pressing members each comprising a stop portion, a pressing portion, and a sliding portion slidably received in the sliding slots of the retaining member;wherein the pressing members are slid down along the sliding slots of the retaining member to make the pressing portions of the pressing members press the cover plates of the expansion cards, the stop portions of the pressing members are stopped under the positioning portions of the retaining member to avoid the pressing portions of the pressing members disengaging from the bent portions of the expansion cards; andwherein the retaining member comprises a main plate and a plurality of parallel limiting blocks, each limiting block has a substantially T-shaped cross section and comprises a main piece parallel to and spaced from the main plate, a connecting piece is connected between the main plate and the main piece, the positioning portion protrudes on an upper portion of the main piece, and each of the sliding slots is bounded by two adjacent limiting blocks and the main plate. 11. The electronic device of claim 10, wherein a notch is defined in each of the bent portions, a plurality of raised portions protrude on the support wall to engage in the notches respectively. 12. The electronic device of claim 10, wherein two blocks are formed on the rear panel at opposite sides of each of the card slots, each of the cover plates is limited between the blocks. 13. The electronic device of claim 12, wherein each of the pressing members comprises a resilient main body, the stop portion extends from an upper portion of the main body, the pressing portion extends from a lower portion of the main body. 14. The electronic device of claim 13, wherein the pressing portion of each of the pressing member is substantially L-shaped. 15. The electronic device of claim 14, wherein a handle extends from a distal end of the stop portion opposite to the sliding portion. 16. The electronic device of claim 15, wherein at least one connecting portion is connected between the main body and the sliding portion.