The "culprit" is found! The front panel board is to blame for everything, part number: CN-05Y1J9  [IMAGE]   After the substitution (from the working server) - the problem disappeared. I want to try to reflash it if possible, re-ordering a new one. I can't find the firmware for it ...
Good afternoon.  There is a Dell PowerEdge R330 server. A strange malfunction has appeared: after a cold power-on (after several days of inactivity), the server can work from one to several days on its own turn off. Life cycle controller - works. On the enable command, the following message is displayed in the LCC log: "RAC0701 Requested system powerup." and nothing happens - the server does not turn on. When the power button is pressed, the server starts up and shuts down at random during the initialization procedure.  Similar issues have been found on the forums. According to the recommendations, we updated all the firmware for the current ones, including the power supply unit. The result is the same. If you turn off the power to the server (remove the wires on both power supplies) and then turn it on after a few minutes, the problem repeats - the server starts and turns off at an arbitrary time during the initialization procedure. If you de-energize it for a day and then turn it on, then it will start and work from one to several days and again turn off arbitrarily and everything will repeat again. The built-in diagnostics showed no problems.  Has anyone come across a similar one?  Thanks in advance. 
Dell PowerEdge R330 - Spontaneous Shutdown