IBM IntelliStation M Pro Type 6868 User Manual page 94

Before you begin
Read "Preparing to install options" on page 62.
Read the instructions that come with the new adapter.
Turn the computer and all other connected devices off.
Disconnect all cables attached to the computer and remove the
computer cover (see "Disconnecting cables and removing the
cover" on page 64).
Note the position of the metal cover so it can be replaced later.
1. Review the instructions that come with the adapter to determine if it
must be installed in an AGP or PCI expansion slot.
2. Remove the access clip 1 on the rear frame by sliding it upward
approximately 12 mm (0.5 in) then slide it to the right until it comes
off.
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IntelliStation User Guide