Nvidia DGX-2 System Service Manual page 90

Make sure you hear the click from the clips to indicate that the lid is locked in place.
3. Push the motherboard tray into its slot on the DGX-2 System
4. Once the tray is pushed in all the way, push up on the levers to complete the engagement
with the chassis and finalize the insertion, then secure by tightening the thumbscrews.
DGX-2 System
Motherboard Tray Removal and Installation
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