Dell Dimension 4400 Owner's Manual page 77

Press the card clip lever on the side of the AGP card to release the card
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from the slot connector, and remove the card.
AGP card
card clip
lever
AGP card clip
slot connector
NOTICE: Visually inspect the position of the securing clips on the memory
connectors and make sure that they are secured in the vertical position in the
cutouts on the ends of the memory modules (see page 75). Otherwise, the
securing clips may prevent the AGP card from being properly reinstalled.
To replace the AGP card, gently press it down into the slot connector
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until it clicks into place. Press the card clip lever while inserting the
card into the slot connector.
AGP card
card clip
lever
AGP card clip
slot connector
back of computer
back of computer
Adding Pa rts 77