Dell Dimension 4500S - Manual (Page 17)

S e t t i n g U p 17
3 Rotate the computer so that the stand is at the bottom and the drives
are at the top.
To remove the stand:
1 Turn the computer over so that the stand is at the top.
2 Loosen the thumbscrew and lift the stand away.
3 Place the computer in a horizontal position.