MSA2312i Storage Controller failure

[Amigor]

Hello, dear forum users.
Could you please help resolving issue with HP MSA2312i controller?

Once it has been turned off for several hours, but after power on there's a failure with controller [A].

I tried switching on and off again, but still no result - its just fails. After ejecting and putting it back- there's also no result. Btw, absolutely no indicators on the rear panel for that controller.

Any ideas on this failure?

Event log: 

- B6918 314 There is a problem with a FRU. (FRU type: Controller module A, enclosure: 1, product ID: , SN: , version: , related event serial number: B6917, related event code: 313) 
- B6917 313 RAID controller A failed, reason Boot handshake timeout. Product ID , S/N\

[Cali]

Have the same Yesterday after Power Off MSA 2040 FC for 2 hours.

Controller A did not come back.

Try erverything (Swap Controllers, Pull/Put, ...).

Did not Help, Open a Support Case and yust now the replacing Controller is here.