We received a Dell R620 server from the factory. It was sent without a DVD drive with the normal process to install via network drive. We don't have that ability. So we ordered the appropriate DVD drive from Dell. We are trying to install Oracle Linux OS, but the Server doesn't seem to recognize the DVD drive. Is there something that needs to be done to the server, so that we can make the DVD recognizable to boot from? we've also tried to boot from a USB flash drive, but as mentioned in other posts, that seems like an impossibility.