Control Module is not installed

Hi there,

Currently have an issue with a PS6100 SAN, we have dual control modules configured.

This morning the secondary control module is now stating an error message of: Control module is not installed. 

It also seems that it is constantly rebooting as the power LED is lit up on the unit itself, it sometimes boots up and is view able on the GUI but then it disappears again a minute later with the above error.

Any thoughts of why this has occurred and if there is a simple fix?

Thanks