Dell Dimension C521 - Manual (Page 71)

Removing and Installing Parts
71
7 Before you close the card retention door, ensure that:
• The tops of all cards and filler brackets are flush with the alignment bar.
• The notch in the top of the card or filler bracket fits around the alignment guide.
1 bracket within slot 2 bracket caught outside of slot 3 alignment bar
4 alignment guide 5 fully seated card 6 not fully seated card
5
6
2
1
4
3