Is there a way to remotely restart the server?
Can the server be restarted via iDRAC?
If the server seems to be hung or is not responding, the first thing to check is whether the physical console is available. This requires either a physical monitor or keyboard if it is a Dell server. If it is a Symantec S500 series appliance, it will require a serial console connection.
Often times the server needs to be rebooted. If physical access is difficult, the best way to do this is to use the onboard iDRAC interface. Depending on the version of iDRAC, follow the steps below.
Once the server is back up and running, if interested in understanding what may have happened, generate a Customer Service Report (CSR) and open a case with technical support. It is always recommended to take a look at Dell's website to see if there are firmware updates for the iDRAC. Often there are fixes in the iDRAC that can address minor hardware issues.