Lenovo HX1310 Installation And Service Manual page 188

Note: Make sure that all the system board standoffs engage the system board correctly.
Figure 107. System-board standoffs
Step 3. Fasten the two thumbscrews (one is near PCI slot 2 and one is near the fan 5).
Figure 108. Thumbscrews engagement
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HX1310, HX2310-E, HX3310, HX3310-F Installation and Service Guide
System board handle
System board handle
System board standoffs
Thumbscrew
Thumbscrew