Step 7.  Install the server into the rack cabinet. 
a. 
Lift the rail latches on both sides.
b. 
Gently slide and push the tray into the rack cabinet.
CAUTION: 
To avoid hurting yourself, keep your hands from the latch area when the latches approach 
the outer rail.
Step 8.  Secure the tray with two M6 x 16 screws to the front of the rack cabinet. 
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ThinkSystem ST250 V2 Maintenance Manual