Sony PCV-LX800 - Manual (Page 40)

VAIO Slimtop™ Reference Manual 26
5 If you do not replace the card or install another add-in card, install a
slot cover over the vacant slot at the rear of the chassis (see
“Covering
an Open I/O Slot” on page 41).
6
Replace the system cover (see “Replacing the System Cover” on
page 23).