Dell OptiPlex XE2 (Mid 2013) - Manual (Page 13)

Removing the Expansion Card
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the cover
NOTE: If your computer has a powered expansion card perform step 3 and step 4, else move to step 5.
3. Disconnect the power cable from the card. Press the tab to release the card-retention latch.
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