Be sure all cables are properly aligned and securely connected for all external and internal components.
Remove and check all data and power cables for damage. Be sure no cables have bent pins or damaged connectors.
If a cable routes through air baffles or other components, be sure the cords and cables connected to the compute module are routed correctly through the baffle.
Be sure each device is properly seated. Avoid bending or flexing circuit boards when reseating components.
If a device has latches, be sure they are completely closed and locked.
Check any interlock or interconnect LEDs that might indicate a component is not connected properly.
If issues continue to occur, remove and reinstall each device, checking the connectors and sockets for bent pins or other damage.