Apple PC Compatibility Card 7-inch card - Manual (Page 144)

3 Locate the PC Compatibility Card.
4 Disconnect the cables attached to the card. Be sure to pull the connectors, not the cables.
Remember where the cables were attached so you can replace them later.
5 Remove the card by firmly lifting it straight up.
Grasp the card by its sides to remove it.
IMPORTANT Do not rock the card side to side as you remove it. Doing so may
break the card or damage the slot.
Removing the old DIMM
1 Determine if there is a DIMM in the DIMM slot.
If there is no DIMM in the slot, skip the next step and go to the next section,
“Installing the New DIMM.”
135 Adding Memory to a PC Compatibility Card