Dell Vostro 220 (Late 2008) - Manual (Page 110)

110
Power Supply
a Reinstall any PCI or PCI Express cards (see "Installing a PCI or PCI
Express Card" on page 60).
b Slide the optical drive back into the drive bay.
c Replace the chassis support bracket (see "Replacing the Chassis
Support Bracket" on page 57).
5 Follow the procedure in "After Working on Your Computer" on page 45.
DC Power Supply Connectors
Vostro 420
P7
P8
P9
P4
P3
P6
P5
P2
P1
P10