NEC POWERMATE V Service Manual page 82

3-10 Option Installation
Press the board firmly into the expansion slot connector. Gently rock the board
from side-to-side to seat it into the connector.
6. Insert the screw removed earlier to secure the expansion board to the support
bracket.
Figure 3-10 Inserting the Board in the Minitower
7. Attach any signal cables required by the expansion board.
8. Replace the system unit cover.
Figure 3-9 Inserting the Board in the Desktop