Hi [NAME] Mukhia,   It seems that you have already done most of the troubleshooting that could resolve the issue. Since the server is under warranty, I suggest making a call to the support to create a ticket for warranty hardware replacement, probably a mainboard replacement is needed. They may suggest collecting logs from the server for their analysis. 
Hi all, I have a Dell PowerEdge R740 server which has unexpectedly failed with the following error: RAC0501: There are no physical disks to be displayed.1. Ensure that the supported physical drives are inserted into the enclosure or attached to the backplane.2. Make sure that the latest iDRAC firmware is installed.3. Reset iDRAC to its initial state. To reset, click Maintenance > Diagnostics > Reset iDRAC to Factory Defaults. Run the RACADM command at the Command Line Interface (CLI): racadm racresetcfg.4. Restart the server. To restart, click Configuration > Power Management > Power Control > Power Cycle System (cold boot). Run the RACADM command at the Command Line Interface (CLI): racadm server action power cycle.5. Make sure that the host server is powered on.   I tried to replace the PERC card but the issue remains the same. Is there anyone with the solution? I would be grateful if someone could help with this. Having a lot of issues since the server has been down for almost a month.       Thanks, Durga Mukhia Systems Engineer, Bhutan. 
RAID controller error