CEM3 Stuck on ETC CEM3 Screen

Symptoms

CEM3 does not boot
LCD shows "ETC CEM" screen and stays there
No control of the system

Potential Causes

1. Poor network conditions
2. A failing backplane 
3. Either the CEM3 bootline has been corrupted and mostly erased, or the bootline fell back into a "testing" state.  This may be due to interruptions in the boot process, either through random resets, power issues, or problems during a firmware update.
4. Another possible cause is a FLASH failure, though this is rare.

Fix/Solution

Try disconnecting the rack from the network and rebooting. If able to successfully boot without network landed, check for IP conflicts and double check all cable terminations.

If it still doesn't boot without network landed, and you have a second Sensor3 rack that's working, try powering down the racks and swapping CEM3s. If the issue follows the CEM3,  please contact ETC Technical Services to begin the RMA process. If the issue stays with the rack, contact your ETC Dealer or ETC Technical Services about replacing the backplane.