My working/runing R730 stuck on Initializing firmware interfaces after restart. Server was working prior to that and nothing was changed.

I cannot do anything from this point on.

I cannot enter BIOS (F2).

I cannot enter Boot Manager (F11).

In community I found one sugestion to disconect power cord for 30+ minutes and restart. Unfortunately that did not help either.

My current version:

BIOS 2.13.0
iDRAC w/ LCC 2.82.82.82 

I would be pleased of any advice to solve this issue. Please be aware that I am not an IT expert.

Thx in advance.