Hi, Please try the below troubleshooting steps.   
Spontaneous power loss condition in my server, and it made the server unable to boot, or boot was not found, after that I changed the boot mode to bios, previously uefi, and after looking at idrac, in the storage section I found the error "RAC0501: There are no physical disks to be displayed. 1. Check if the host system is powered off or shutdown. 2. Check if the physical disks are inserted into the enclosure or attached to the backplane. 3. There are no out-of-band capable controllers detected." Can anyone help me? my data is so important [IMAGE]
RAC0501: There are no physical disks to be displayed. DELL PowerEdge R730