Re: CX4 sense cable issue
Restart both Management Servers one at a time, and 5 minutes apart (this is to let each SP to fully come back up before restarting the other SP).
Using the "IP_Address_SPx/setup" GUI, open the setup page on BOTH Storage Processors (use two browsers - one for SPA and one for DPB):
Go to the Restart Management Server section on each SP, then restart on SPA and wait for for it to finish - refresh the browser) , then do the same for SPB.
See below KB article for help if needed.
See KB article https://support.emc.com/kb/31599