Dell PowerEdge M420 Hardware Owner's Manual - Page 257

To remove a half-height blade system board, hold the blade chassis with one hand, lift and pull the system board retention latch with the other hand, and then slide the system board out of the open end of the chassis. See Figure 3-59. Figure 3-59. Removing and Installing the System Board - Half-Height Blades 1 2 3 5 4 1 I/O connector cover 3 system board 5 slots in system board tray 2 retention latch 4 tabs on system chassis NOTE: If you are removing multiple mezzanine cards, label them so you can replace them in their original locations. 10 Ensure that the I/O connector cover is still in place on the I/O connector at the back of the board. See Figure 3-58 or Figure 3-59. Installing Blade Components 257