HP DX2200 - Manual (Page 14)

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Hardware Upgrades
Installing an Expansion Card
The computer has two PCI expansion slots that can accommodate
expansion cards up to 17.46 cm (6.875 inches) in length, one PCI
Express x1 expansion slot, and one PCI Express x16 expansion slot.
1. Turn off the computer properly through the operating system and
turn off any external devices.
2. Disconnect the power cord from the power outlet and the
computer, and disconnect any external devices.
3. Remove the access panel and lay the computer on its side with the
opening to internal parts facing up.
4. On the rear panel of the computer, remove the screw that secures
the slot cover lock in place 1 and slide the slot cover lock up and
away from the slots to remove it from the computer 2.
Releasing the Slot Cover Lock