I have one Force180 with 3.4.1. or with 3.5 (not sure) which won't boot.
SM is connected via PoE adapter and power light is on. Ethernet light never even flashes, there is very small flash for 3. signal light, but barely visible. SM is not reachable via ethernet.
Solved! Go to Solution.
In case Ethernet LED doesn't flash at all device can be broken.
You may try to recover FW through u-boot recovery mechanism to exclude possibility of FW crash.